Get the solution to the bonus riddle here: brilliant.org/TedEdGiantIron/! Also, the first 833 of you who sign up for a PREMIUM subscription will get 20% off the annual fee. Riddle on, riddlers!

@shoaibakhtar4389

5 жыл бұрын

I watch all of your videos. So please reply.

@constanzagoldschmidt8025

5 жыл бұрын

Cool puzzle and cool solution!

@awertystack9772

5 жыл бұрын

Krishna Kumar You forgot the possibility of GB-GB-GB-GB. It would take a few more tries to see which are good and which are bad.

@BH-pk6ng

5 жыл бұрын

does the combination need to be one that is tested? Because I came up with a scenario in which the worst case would mean that the remaining combination are the good ones.

@michaelwpannekoek

5 жыл бұрын

the link does not seem to be working, it just redirects me to the homepage

wow if I’m ever in a situation where I have to iron a giant shirt with a giant iron and a bunch of batteries I’ll know exactly what to do

@fal4thought

4 жыл бұрын

tHaNkS tEd Ed

@royallobster7899

4 жыл бұрын

kzread.info/dash/bejne/gp9_o6qrn6W6pKQ.html

@georgplaz

3 жыл бұрын

and if there are exactly 8 batteries of which 4 are dead and 4 are good AND you only have 7 tries for some arbitrary reason

@xexpaguette

3 жыл бұрын

@@georgplaz because the batteries are apparently dungbells.

@Penguinloverz37

3 жыл бұрын

Royal Lobster 78 don’t self advertise

In the last riddle, you only need to try once because the giant baby didn’t messed it up this time.

@anomynousanomynous9847

5 жыл бұрын

lol

@weareallgonnamakeitbrah5950

5 жыл бұрын

Man,I think,""""YOU DESERVE MORE RESPECT THAN TRUMP FOR THIS ANSWER!!!!!!!!!!!!!!""""""

@khatunamezvrishvili6211

5 жыл бұрын

yeah!

@anngoquoc4686

5 жыл бұрын

Well, I think of that too. LOL 2000 IQ

@pilotcrab3697

5 жыл бұрын

😂🤣😁😆😄😃😀😀

Nobody: Ted-Ed Riddle Master: You die if you can't solve this riddle.

@lisahellier5301

3 жыл бұрын

Fair

@corncake4677

3 жыл бұрын

Not funny

@person0809

3 жыл бұрын

Exactly what would happen in real life (This is a joke, don't take this seriously)

It would take way less effort to roll the batteries than carry them on your back, you know.

@blabla-rg7ky

4 жыл бұрын

hey, you're not s'pposed to use logic and common sense on these bogus riddles!

@chrisding1976

4 жыл бұрын

bla bla they are good riddles, because they are hard. But to create a good riddle, you need to create a difficult situation, hence the restrictions.

@blabla-rg7ky

4 жыл бұрын

@@chrisding1976 maybe...

@Yoyble

3 жыл бұрын

ZHBG 9224 bfdi profile picture

@arikakarin2323

3 жыл бұрын

I DIDNT KNOW

"Or else you'll end up being the main course tonight" *Looks at the size of the manager* If that's the main course, I think the giants are on diet

@user-su1xy6fi4u

5 жыл бұрын

@Otaku potato LOL

@inanjarif1388

5 жыл бұрын

Actually,the "diet" you are thinking of is called slimming, where people eat less to lose weight. Using "calorie-controlled diet" is more appropriate. And yes,I am a huge nerd.

@siregg8528

5 жыл бұрын

Ikr

@KarishmaChanglani

5 жыл бұрын

They got to look fly for that party after all.

@ShiaTheBunnyGirl

5 жыл бұрын

LOL

I love how there's absolutely NO good reason this riddle has to be about a giant family's servant or an iron.

@sudipaghosh5408

3 жыл бұрын

Paradoxic comment

@silvanobianchini6924

3 жыл бұрын

actually, there is: if they were regular size batteries, testing more than 7 pairs would be very easy, it takes very little time to do so. But by being giant, moving them takes a lot of time, and thus you are limited to 7 tries only

@pilly6548

3 жыл бұрын

@@silvanobianchini6924 i will still put all my power for the 8th try cuz i dun wanna be someone's food

@yueshijoorya601

Жыл бұрын

But also, just to make the pun Giant Iron.

@Inkyminkyzizwoz

Жыл бұрын

I saw a video from someone else with the same riddle about an ordinary torch

Just do the old "lick the battery to see if it zaps you" trick

@solitarystride

3 жыл бұрын

its giant battery the shock might just kill you on the lick 👅

@PyroGothNerd

3 жыл бұрын

@@solitarystride That's fair

@ididnothingatall

3 жыл бұрын

@@PyroGothNerd yes

@emiliatan5792

3 жыл бұрын

@@solitarystride well, it's die either way

@solitarystride

3 жыл бұрын

@@emiliatan5792 True everyone dies sooner or later 😉

Step 1: Ask the batteries if you have green eyes Step 2: Ask the giant baby if you can leave

@goldenexperience5930

4 жыл бұрын

Ratin correct

@bonyfax2345

4 жыл бұрын

You forgot to ask them “if you’re powered, would you say ozo?”

@legendofgaming3851

4 жыл бұрын

@@bonyfax2345 lol

@TheEpicXenemorph

4 жыл бұрын

And all boxes with an even number must have a red lid ontop

@anime4life930

4 жыл бұрын

Ratin just stop everyone is doing this like bruh we don’t care

me watching knowing full well i can never solve any of these damn riddles

@_CSE_ShiwamBhagat

5 жыл бұрын

I agree

@oishd6077

5 жыл бұрын

Me too sis

@darklightmotion5534

5 жыл бұрын

I manage intuitively or not at all

@jonathanodude6660

5 жыл бұрын

A couple of them have been solvable. this aint one of them though

@Abigailk59

5 жыл бұрын

I just watch these videos so I can give the riddles to my family.

Just plug the iron to the electric socket.

@wahhajmustafa1907

5 жыл бұрын

kirby march Barcena nah, the plug is too heavy

@ThoraninC

5 жыл бұрын

I’m going to do bouncing life hack but dang, I can’t make these big o’ battery bounce

@woodfur00

5 жыл бұрын

wahhaj musthafa Loosen your Aspect Corset to make ant physics stronger

@jmvr

5 жыл бұрын

But it has no power cord...

@funtainment777

5 жыл бұрын

Doesn't have a cord :(

This riddle seems quite simple when you first hear it, but turns out to have a much more elegant solution than expected. That’s what makes it a superb riddle.

Gotta give props to Ted Ed for coming up with very well justified back stories for all of their riddles

Girl, who would serve that tiny of a human "as a main course" to those giants? smh.

@Stratelier

5 жыл бұрын

Clearly he would be the garnish ON whatever their main course was.

@awesomepuppy215

5 жыл бұрын

Stratelier Do you know what you’re saying

@DJTileTurnip

5 жыл бұрын

You dont know. You've never eaten a human. I hope

@abigaildunn1791

5 жыл бұрын

I’m pretty sure that the human *is* a garnish.

@jokeating2237

4 жыл бұрын

DJ Tile Turnip That’s where you’re wrong.

I think we’re missing the point here. If I don’t iron his shirt, my boss will eat me? The solution is clear: unionise and overthrow the tyrannical employer!

@georgequilitz8530

4 жыл бұрын

but its just you

@pauldominiqueschal6769

4 жыл бұрын

but how will you do that, if even his baby is 3 times bigger than u?

@MahraiZiller

4 жыл бұрын

George Quilitz that only makes unionising easier 😉😂

@MahraiZiller

4 жыл бұрын

Paul Dominique Schal I admit, I may be oversimplifying the complexities of the political-economics of fantasy universes.

@kislayanand4641

4 жыл бұрын

I had read unionise as un-ion-ise and kept wondering where they displayed the ionising gun in the puzzle😅

TedEd: *”Can you solve the **_________** riddle?”* Me every time: Nuh.

@jakyloyjuan

4 жыл бұрын

"giant iron"

@christinabarfoot1389

3 жыл бұрын

And yet I watch every video

I think the bonus problem is the same as the other but in reverse. We need all the working batteries in the iron, meaning we're looking to have two dead batteries out of the iron rather than two working ones in it. If you divide them into the same groups, you can put one group of 3 and the group of 2 into the iron leaving you with one space. Test each from the other group of 3 in turn and if it doesn't work that means that that group contains at least two good batteries. Swap them out with the other group of 3 and repeat. If you get the same results then the same must be true and there are at least two good batteries in that set meaning that the group of 2 will both be dead.

@lenovotablet992

2 ай бұрын

They haven't been messed up this time

@kentlab3850

Ай бұрын

Brillant solution. Tho i still don't undertsand why the iron needs 6 batteries if it only need 4 to work, they could just have it be 4, it would end up being the same

Why don’t u bounce the batteries to see if they good or not

@Inkyminkyzizwoz

5 жыл бұрын

Because that won't work!

@shoaibkayani1496

5 жыл бұрын

That's what I was thinking too

@robm131

5 жыл бұрын

shoaib kayani why??

@kransp

5 жыл бұрын

How do you propose to bounce these batteries that are as tall as you are in a way that allows you to still get the shirt ironed on time?

@kudoamv

5 жыл бұрын

I am not so strong to bounce batteries

There's another solution: Divide batteries into 4 pairs. Check 3 of the pairs. Check 1st remaining battery with both batteries from one of the pairs. Check 2nd remaining battery with both batteries from a different pair. I'll let you figure it out yourself why it will always work.

@GordonHugenay

5 жыл бұрын

it took me 5 minutes to verify this solution, but it's perfectly valid for me, thank you

@piotrkakol1992

5 жыл бұрын

@@GordonHugenay Glad to have helped. :-)

@jackwuchannel

5 жыл бұрын

edit: i actually realized this was the same solution as the TED-ED one, just rearranged in groups and order. whoops. this works :D it's only the 2nd valid solution I've come across so far, the TED-ED one and this one i came up with the same solution, and i know why it'll always work how long did it take you to come up with this? took me 45min-1hr. took a lot of wrong turns and was actually pretty close to the solution for the while but never put two and two together into the solution

@udayyakula8265

5 жыл бұрын

piotrkakol1992 but you will lose a chance of getting it right in 4th try itself by not testing the last pair of batteries as both the remaining batteries can be good ones

@littleote

5 жыл бұрын

In the end you are doing the exact same thing only trying the same combinations in different order.

"or you'll end up the main course" Boi we are like smaller then their fingers,

@thegamergirl6164

2 жыл бұрын

ya lol XD

Solution: Throw away the batteries right when they die. Simple.

@myhlosic

4 жыл бұрын

Or buy rechargeables and recharge them immediately when they die

@NoriMori1992

4 жыл бұрын

They might be saving them to take to the recycling depot. It'd be way too much trouble to make a trip there every time a battery dies.

@colonelcorneliuscornwall3547

4 жыл бұрын

NoriMori, but put them in a cup? And put that cup right next to the cup with the working batteries?

@BappO-is-me

4 жыл бұрын

Yeah, and let’s not forget that they were in a baby’s reach

@mahbubmaleksyed5301

4 жыл бұрын

@@colonelcorneliuscornwall3547 that's the reason this mess happened anyway

After about 3 minutes, this video started sounding like "if you have 4 good batteries and battery on the giant iron, then your giant iron battery in the good battery pile, would only be 2 possible combinations of the giant battery. And if you remember, the 1 bad battery with the testing all the good batteries would take too long for the good batteries to a giant testing"

@FaustVaz

5 жыл бұрын

starvalentinobeatz 8 possible tries, so no

@queenofunderland

5 жыл бұрын

I have a little question. Imagine:What if it were different? @starvalentinobeats 1.when... on the first 3 battery pile, you find out that the iron works? Then there must be 2 batteries work, then you test again on 3 possible combinations. The other three is the same.. When it does live, we know we need to test other 3 possibilities to know who is living. Summed up, There we have already 6 tries. And then how is the other two? We have acquired two living batteries or even more in the other piles. Then we could know, what fate shall this energy source have.. How do you find it? 2. When it were like this video instead, when 3 combinations o.n a pile fail, then you know only one or none is. WORKING? This is the real big question : BUT HOW DO YOU TELL, WHICH ONE THEN IS THE WORKING ONE from these fail combinations ? There is some fishhy things on this ridfle..

@starvalentino

5 жыл бұрын

@@queenofunderland I think you just solved the riddle!!!!

@ishwantsingh955

5 жыл бұрын

@@queenofunderland i dont quite get what u mean. Can u elaborate?

@ikrar26

5 жыл бұрын

@@queenofunderland lol u only need 2 batteries.. so if first group is work than udont need to fnd another batteries.. lol

I did it a different way. 1. Test A&B 2. Test C&D 3. Test E&F If none worked, now you know that G&H has either one or two good batteries. If one, then each other pair also has one good one. If both G&H are good, then only one of the other pairs can have two bad ones. 4. Test G&A 5. Test G&B If A&B were both bad, C&D must contain a good one and also H must be good. Or, in the case that each pair had one bad one, G was bad, so again, H would be good and C&D must contain a good one. So finally, 6. Test H&C 7. H&D must work if none of the other tries did.

@atmankulkarni

5 жыл бұрын

I came up with same logic. Both of them are correct & in fact, the combinations are similar, just arranged & explained differently. Two groups of 3 & remaining 2: Group 1(A&B, G&A, G&B), Group 2(C&D, H&C, H&D), E&F.

@happyfalcon1842

5 жыл бұрын

What happens if G&H are both good? You need another go to test it

@LughSummerson

5 жыл бұрын

If G&H are both good, that means that the other three pairs must be distributed like so (or else one try would have worked), although not necessarily in this order: good & bad good & bad bad & bad So when you test G with A and then G with B and neither work, A&B must have been the two bad ones. That means that C&D must contain at least one good one. So in the case that G&H are both good, H is good and either C or D must be good if you got that far.

@aloysiusdesa9384

5 жыл бұрын

i tried this way, but you need a maximum of 8 tries in the worst case scenario

@LughSummerson

5 жыл бұрын

What distribution needs 8 tries?

TED-Ed: Can- Me: *interrupts* Me: no I cannot solve that riddle.

Alas, I thought this was a straightforward one, but I failed to solve it. I'm embarrassed. I think I got the bonus riddle though. It's actually the same exact problem as the original riddle, but in reverse. In the original riddle, you're choosing which sets of 2 to put in, whereas in the bonus riddle, you're choosing which sets of 2 to leave out. In the original riddle, you're looking for 2 good ones (to ultimately put in), whereas in the bonus riddle, you're looking for 2 dead ones (to ultimately leave out). So the answer is still 7 tries, using a similar procedure.

@spunc8820

5 жыл бұрын

I just came to this conclusion as well. And I was working so much extra math and logic to this bonus problem at first.

@gayaraaukwaththa9170

4 жыл бұрын

You guys didn’t have to be embarrassed because everyone who clicks on these riddle videos knows damn well they might not be able to solve them.

@coconoisette

4 жыл бұрын

@@gayaraaukwaththa9170 I'm not even trying to find the answer myself at this point lol

@soprecise7993

4 жыл бұрын

You can’t test a singular group of 3 batteries when it requires 4 so how would u do it

@unknownunknown2575

4 жыл бұрын

@@soprecise7993 You still can group them in the same way: ABC, DEF, GH. However, when you are "testing" AB, you actually put CDEFGH into the iron. Therefore, the bonus question is the same as the main question, just that you need to see it from another angle.

I prefer the iron giant riddle

@NikoCubeRoot

5 жыл бұрын

Ok

@jugemujugemugokonosurikire4735

5 жыл бұрын

Hi

@jmvr

5 жыл бұрын

@@buddyclem7328 I love the doctor. Doctor Who? Exactly.

@michaeltobin2172

5 жыл бұрын

Quit watching just2good I see

@paulgleason1

4 жыл бұрын

Why

I was thinking about making 4 random pairs and trying them all, then if it doesn't work, you know there's one good battery in every pair, so if you grab two of the pairs you can find the right two, but that can take up to 4 more tries, which makes a total of 8.

@alksjhdfg

2 жыл бұрын

Rachelle, you’re bang on except you’ve forgotten that, if the “up to 4 more tries”, you already know the result of two of the tries because you trialled them when you tested out the four pairs at random. This is my explanation: 4 good batteries and 4 bad batteries, right? Separate them into four random pairs and test all 4 pairs. If one of the pairs makes the iron work, great! But if not (you’re 4 tries in at this stage), that means that each pair consists of one good and one bad battery. Take any two pairs at random and discard the other 4 batteries. You now have 4 batteries of which 2 are good and 2 are bad. Swap the pairings and try the first pair - either you’ll now have matched up the two good batteries and the iron will work (after attempt 5) or you’ll have matched up the two bad batteries and it won’t work, so you then know the other two batteries are both good and it’ll work on try 6! Edit: actually on those 5th and 6th tries, I’ve realised it’s possible to, again, pair up a good battery with a bad on both occasions, but if this happens, you just pair up the two batteries that haven’t been paired up yet and those will be two good ones 🙂

@raptagames

Жыл бұрын

you can get it with 3 more tries, If you checked (1/2) and (3/4) in part one, you can continue with (1/3) and (2/4) and (1/4). If non of them work you only have (2/3) remaining and it must be the right one.

@arcanecrow7498

Жыл бұрын

@@raptagames I thought so too, unfortunately it must power up in 7 tries, not just know the answer in seven.

I dunno just quit the job..

@Anastas1786

4 жыл бұрын

But then you'll lose your spectacular dental and retirement plans!

@jeremyaster7470

4 жыл бұрын

Get eaten

@szymonsokolinski9907

4 жыл бұрын

But they pay a lot

@sirk603

4 жыл бұрын

What is it’s really just slavery and the giants call it a job to make it sound better

@Mel-kh2jn

3 жыл бұрын

rio ranger!

“Has six battery slots” *shows 2*

@rattoota

4 жыл бұрын

Batteries can stack like flashlights

Split the batteries into four groups of two each. Try each group. If none work, then the dead ones are evenly distributed, one in each group. Take two of the groups (each containing one good battery and one dead one) and then try the remaining combinations.

@nixihaloed2068

5 жыл бұрын

But then in worst case scenario, we would need 8 steps. First four steps are as you said(A&B, C&D, E&F, G&H). Fifth step is A&C, sixth A&D, seventh B&C and eight B&D

@fern21

5 жыл бұрын

@@nixihaloed2068 Actually we don't need to try the B&D as when the 5th, 6th and 7th tries failed, we know both battery B&D are working.

@MP-pz2qq

5 жыл бұрын

@@nixihaloed2068 No need to do B & D. After doing B&C you can tell which two batteries are good.

@akashiseijuro4444

5 жыл бұрын

I agree..... But in the worst case scenario, you'd need 8tries.... I tried that way too....

@Glonkledinkthe3rd

5 жыл бұрын

But that will take more

Thanks! Now I’m prepared if I ever get stuck in the COMPLETELY LIKELY situation of being the butler for a giant.

Why Giants do not hire a Giant Butler??🤔

@pauldominiqueschal6769

4 жыл бұрын

maybe giant butlers are too expensive

@hrishikeshmavily5533

4 жыл бұрын

Because giant butlers are too lazy

For the Bonus Riddle, the answer is exactly the same as the regular riddle, just mirrored in a way. Instead of testing for 2 good batteries to put in the iron, you have to search for 2 bad batteries to leave out. Since good and bad batteries occur equally, you do the exact same grouping and testing pairs strategy as in the first riddle, only you leave the pairs out instead of putting them in.

@derekhansj

Жыл бұрын

@@HT-vd4in it’s the same, the information you get is just the opposite, if it works, it means the two you left out is dead If it doesn’t work, atleast one of the batteries you left out is working You’re just testing for dead batteries to leave out instead of working batteries to use

@HT-vd4in

Жыл бұрын

How exactly are you doing this? Tell me step by step?

@derekhansj

Жыл бұрын

@@HT-vd4in you number the batteries from A to H step 1, insert batteries but leave AB out if it doesn’t work at least of AB is a working battery Step 2, insert batteries but leave BC out if it doesn’t work at least one of BC is a working battery Step 3, insert batteries but leave AC out if it doesn’t work at least one of AC is a working battery ( so among ABC at least 2 are working ) Step 4, insert batteries but leave DE out if it doesn’t work at least one of DE is a working battery Step 5, insert batteries but leave EF out if it doesn’t work at least one of EF is a working battery Step 6, insert batteries but leave DF out if it doesn’t work at least one of DF is a working battery ( so among DEF at least 2 are working ) By now you would have checked 6 times, and you can conclude that GH are both dead batteries if the iron hasn’t worked yet as among ABC two of the batteries are working and among DEF two of the batteries are working So for the 7th step you just insert ABCDEF and leave GH out, this will guarantee that the iron will work if it hasn’t yet after step 6

@HT-vd4in

Жыл бұрын

@@derekhansj thanks. Wow 🤩

How many of you are here just to find answerof the bonus riddle??

@jackashcroft5795

5 жыл бұрын

At least 3

@jackwuchannel

5 жыл бұрын

the answer is seven

@xiaoshen194

5 жыл бұрын

6 is the answer

@xiaoshen194

5 жыл бұрын

@@jackwuchannel 6 bud

@jackwuchannel

5 жыл бұрын

@@xiaoshen194 REASONING: It’s surprisingly simple. Let’s get rid of “good” and “bad” for a second and just have battery types “A” and “B”, four of each. Now we have our two irons, one from the main riddle, and the other from the bonus riddle. Let’s say Iron A has 2 slots and requires 2 A batteries, while Iron B has 6 slots and requires 4 B batteries. Now imagine putting two A batteries into Iron A, making it power on, and putting each of the 6 other batteries in Iron B. Because Iron A has no B batteries, all 4 B batteries go to Iron B, making it turn on. What if we put at least one B battery into Iron A? In that case, Iron A would fail to start, since it doesn’t have 2 A batteries. And because there is one B battery in Iron A, there is 3 or less B batteries remaining to put in Iron B; not enough to power it on. So, in conclusion, whenever Iron A is on, Iron B is also on, and whenever Iron is off, Iron B is also off. That makes the main riddle and bonus riddle essentially the same question. Now for the question: What is the least amount of tries do you need so that (iron) has 4 Type B batteries in its 6 slots? This is the same question as “What is the least amount of tries do you need so that (iron) has 2 Type A(Good) batteries in its 2 slots?” The answer to this question is seven. Need proof? Go to 0:55. (It’s probably not possible to do it in 6 tries or under). And since the answer to that question is seven, the answer to the Iron B question, or the bonus riddle, must also be seven. And so, there’s our answer. It’s like the same question to “How many tries is needed so that two batteries excluded from Iron B both don’t work?” They’re the same thing; all that is needed to solve the problem is to see the connection.

Step 1: Confirm you have green eyes Step 2: Ask to leave because you’re too overwhelmed to solve the riddle

@isaaclewis8694

3 жыл бұрын

madlad

@thegamergirl6164

2 жыл бұрын

@@isaaclewis8694 ya

In this bonus riddle the baby giant didn't knock the batteries over, so it would just take one try😂

I could never solve these riddles and yet they are just so fun to try!

I love how no one takes this logical riddle seriously.

@warrencaelum9536

Жыл бұрын

because plenty of them are also dumbasses

The answer to the bonus riddle is the exact same but in inverse: Now you have to find two dead batteries instead of full ones. At least one of the groups of 3, 3 and 2 batteries has to have 2 dead batteries, so you test them the same way by making sure the 2 batteries left out are always of the same group, and you should get the iron working with 7 tries or less.

@GaryLuKOTH

4 жыл бұрын

Good observation.

Okay... but why hang on to the dead batteries? Just throw them out.

Here's a riddle: What's the shortest amount of time possible in the universe? The time between me seeing a new Ted-Ed riddle and clicking on it.

@sidzilpe9391

5 жыл бұрын

One Parsec

@aakashkishore1525

5 жыл бұрын

And watching the solution without trying to solve the riddle

@victora73

5 жыл бұрын

Planck time

@NikoCubeRoot

5 жыл бұрын

1e-∞ yoctoseconds. I will like my own comment because no one does

@NikoCubeRoot

5 жыл бұрын

@Jay N ok??? W W W W W W W W

Bonus riddle is 7 tries, because it’s the same riddle in a different way. Original riddle says: pick 2 you put in, and if they are both good, you win. Bonus riddle basically says: pick 2 you don’t put in, and if they’re both bad you win(since that means there’s 2 bad batteries and 4 good ones in the iron, thus making it work). You just put in the following sets: CDEFGH, BDEFGH, ADEFGH: if all fail, there can’t have been a combination of 2 bad batteries between A, B and C, thus meaning at least 2 are good. Next, we test out ABCFGH, ABCEGH, ABCDGH, and if all fail again, we know that D, E and F have no 2 bad batteries in them, so at least 2 are good. That means the combination ABCDEF will always work, since ABC has 2 good ones, DEF has 2 good ones, 2+2=4, and the iron requires exactly that many good batteries. Now here’s hoping none of those batteries died during that testing phase...

@gowrinarayani247

5 жыл бұрын

I think the answer to the bonus riddle is 3. Say we have batteries a-h, first we try a-f, if it doesn't work, we try d-h, if that doesn't work, we try a,b,c,f,g,h. It must definitely work in one of these three tries.

@wolfpaw3394

5 жыл бұрын

@@gowrinarayani247 Your way doesn't work if the good ones are a,c,e,g or b,d,f,h.

You could do it like this (Bonus answer mentioned too) - First try to put the first two batteries, 1 and 2, in the iron. If it doesn't work, one or both of them are faulty. Try with 3 and 4. Also put 5 and 6 inside. If the light didnt work for all 3 of these pairs, there's only two possibilities: A. Three batteries were faulty, one among 1 and 2, one among 3 and 4, and one among 5 and 6. This means one among 7 and 8 is faulty. B. We've already gotten past all four faulty batteries. Two of the three pairs have one bad battery, and both of the last are bad. Maybe there was one bad battery among 1 and 2, one among 3 and 4, and BOTH 5 and 6 were faulty. This means both 7 and 8 are good. Take the first of the last two batteries, number 7. Test it against 5 and 6. If it doesnt work, it could be because 7 was the bad battery in possibility A, meaning 8 is the good one. It could also be because 5 and 6 were the bad ones in possibility B, meaning 8 is still good (because 7 and 8 were both good). We've now used up 5 tries - 1 and 2, 3 and 4, 5 and 6, 7 and 5, 7 and 6. We use the last two on 8. We know 8 is good, and one among 1 and 2 is good. We test 8 with 1, and finally 8 with 2. The iron turns on, leaving you with just enough time to slip out of a window and look back as the un-offed iron burns the giants' house down. The bonus answer is still 7. If you use 6 of the batteries, you have 2 left in hand. Both cant be dead, because then the 4 live ones are in the iron. Either they're both alive, or one's alive and one's dead. Say they're both alive. There are 4 dead and 2 alive batteries in the torch. Say it's like this - A D D A D D We can group them in 2s (A D) (D A) (D D) Since there are 4 Ds and 2 As, one group is guaranteed to have two Ds. We just replace each group with what we have in hand. Step 1: (A A) (D A) (D D) - Replaced A D with the A A in hand. We now have A D. Step 2: (A A) (A D) (D D) - Replaced D A with the A D in hand. We now have D A. Step 3: (A A) (A D) (D A) - Victory! Say it's a dead-alive pair. There are 3 dead and 3 alive batteries in the torch. Say it's like this - (A D) (D D) (D A) As long as there's a pair of Ds, the same tactic as before will work. But what if it's like this? (A D) (A D) (A D) We'll do the same thing. Step 1: (D A) (A D) (A D) - Replaced A D with the D A in hand. We now have A D. Step 2: (D A) (A D) (A D) - Replaced A D with the A D in hand. We now have A D. Step 3: (D A) (A D) (A D) - Replaced A D with the A D in hand. We now have A D. If we haven't won after step 3, there's no (D D) pair. Now, we just have to test both the batteries in our hand against both of the last pair. The possibilities are D D, D A, A D and A A, so it takes 4 more tries, bringing the answer to 7.

@armeetluthra8913

7 ай бұрын

For the bonus riddle, last case: Won't the total number of trials be 8? 1(initial)+3(replacing each group inside iron)+4(getting a working pair from 2 DA pairs)

@JMCJollyRoger

7 ай бұрын

@@armeetluthra8913 What's the initial step?

@armeetluthra8913

7 ай бұрын

​@@JMCJollyRoger You begin with nothing inside the iron. Suppose the first 6 batteries you take already had 4live ones. This is the initial step. You assumed that 6 batteries were already inside the iron and iron was not working, which is incorrect assumption.

@JMCJollyRoger

7 ай бұрын

@@armeetluthra8913 Ah yeah

I puzzled this out all the night and the answer struck me as i was laying in bed!!!!! thanks ted ed for these fantastic riddles :)

Thank you, this information will surely help me

3:12 You only need to try once since no one mess it up this time.

This one was easy, but here’s a harder riddle. How does he flip that giant shirt?! 😂 I appreciate these videos. Thanks TedEd

one of the rare riddles I’ve solved here

Man I love these riddles

Intuitively, the bonus riddle looks the same: instead of "find 2 good" (to use), it becomes "find 2 bad" (not to use).

I’M INSANELY PROUD OF MYSELF FOR ACTUALLY SOLVING THIS ONE!!!

Actually, you can take two peace’s of foil, attach them to both sides of batteries (one by one), and see if it gets on fire.

@pokepros2733

2 жыл бұрын

yay giant fire make me perish

*The **_Irony_** in this video is hysterical!*

@LughSummerson

5 жыл бұрын

It fell _flat._

@funtainment777

5 жыл бұрын

The irnoy is that you tried to make an iron pun in a video with pretty much no irony.

@funtainment777

5 жыл бұрын

nvm that isn't irony either

@sujatahota6147

5 жыл бұрын

That pun tho

As same as the Temple riddle, only it about battries

@seandanielespiritused9863

5 жыл бұрын

O ye

@shtuffs

5 жыл бұрын

Oh

@forcedcomedy6271

4 жыл бұрын

No it really isn't, aside from the fact that this puzzle has four dead batteries and the temple one only has two possessed explorers in the temple riddle, you don't need to figure out exactly who's lying, just the correct way out with the two possessed ones making it more difficult.It came down to figuring out who to trust and either going with majority or process of elimination. The battery one, on the other hand, requires you to find exactly two working batteries out of the eight and you need to make sure both are working. It comes down to you having to make sure you manage to, with certainty, be able to pick out two batteries, both working. Also in the battery one, you can test different pairs while, in the temple one, you only have enough time for one trip out, one trip back and one more in what you think to be the right direction

@mrayrick7631

4 жыл бұрын

Forcea Comedy:“Ooo I’m using big brain words bc I’m big brain”

Legit the first riddle I got right after watching like 10 riddles.

"Helps you develop your joy of learning. " 3:17 I started laughing so hard!

@thegamergirl6164

2 жыл бұрын

same

Prepare to be a snack for the first time in your life

@buddyclem7328

5 жыл бұрын

And last.

@fghfhg9599

5 жыл бұрын

Becaus of your profile pic that i thought there is a hair on my tablet

@shahnazmirza2348

5 жыл бұрын

@@fghfhg9599 dark mode ftw

@legendofgaming3851

4 жыл бұрын

Actually you are the main course

@rattoota

4 жыл бұрын

You didnt have to be that savage lmao

Amazing riddles! Though i cant solve a single one😂😂😂😅

Everytime i saw Ted-ed's riddle video title "can you solve the .... riddle?" My answer is "most likely no, but i will still watch it anyway"

Wow, what a great riddle. I easily came up with a strategy that succeeds in 8 moves. Cutting it down to 7 strongly seemed impossible, until I got a right idea

I had a different solution. That seems more efficient First split into 4 piles of 2. Try each pair. Assuming it fails on all, we know that for each set of 2, exactly one was a bad battery. Then we pick 2 of these pairs, and try every other combination with them that wasn't tried. So if AB-CD was tried, we try AC-BD, and AD-BC. One of those is guaranteed to be working. That gives a solution in at most 6 guesses. We don't even need 7th.

@Ericbro64

2 жыл бұрын

Actually, that's 8 guesses. AB, CD, EF, GH, AC, BD, AD, BC. You are correct that one of those is guaranteed to be working, but if it's BC, then you got it on the 8th try and have failed the puzzle in the worse case.

@Immortal306

2 жыл бұрын

I don't remember what led to this mistake, but I think you are right, was likely wrong at that time. I think I viewed AC-BD as one test, and likewise with AD-BC

I came up with a solution different from TED. It involves splitting the 8 batteries into 4 pairs like some others' solutions below, but where they test all 4 pairs first, their solution at worst case requires 8 tests. I figured out how I could do it in 7 guaranteed by testing 3 pairs first, then *not* testing the fourth pair. So label the pairs A, B, C, and D, with D being the one not tested. If none of the first 3 pairs work, then that means they all have at least 1 dead battery. With 4 dead batteries, that means D has at most 1 dead battery, therefore at least 1 working battery. If D has 1 working and 1 dead, then that means it is true for all pairs. If D has 2 working batteries, that means all 4 dead batteries are in the first 3 pairs, which via pigeonhole means 1 of those pairs has 2 dead batteries (the converse is similarly true). For tests 4 and 5, test battery D1 against both of pair A. If the iron still does not work, then either D1 doesn't work (making all 4 pairs 1 working/1 dead), or D1 is working but both of A are dead (therefore both of D are working). Either way, it proves D2 is a working battery, and both pairs B and C have 1 working/1 dead battery. Tests 6 and 7 will be testing D2 against both from pair B (or C as it doesn't matter which). Since D2 is proven working and one of B has to be working, it is guaranteed by test 7 at latest the iron will be working.

@jackwuchannel

5 жыл бұрын

Good job!

@littleote

5 жыл бұрын

Is the same solution but you arrive to it after a different though process. In both cases you divide in the groups A1, A2 and D1; B1, B2 and D2; C1 and C2. Still, great job getting to the solution.

This is beautiful!

i love how i saw the batteries and the mixup and immediately thought *lick them*

that's a brilliant riddle. So simple, but took me 15 minutes to solve.

@user-nx1yg3tf4j

3 жыл бұрын

I see , you are the guy that solves 4+ years old puzzles in less than 4 years

“Can you so- Me: No

I love how the iron has a seat 😺😺!

NEED MORE RIDDLES

Lick em- that's all you need to do, lick the batteries

@hugosalazar6911

5 жыл бұрын

wallah t un ouf

@ameymorshed4744

5 жыл бұрын

awesome djman uea bit you will get a electric shock to help possibly get hurt alot

@anshgarg7137

5 жыл бұрын

They are giant batteries so they might end up killing you... right?

@buddyclem7328

5 жыл бұрын

@@ameymorshed4744 *_Say what?_*

@snapple1877

5 жыл бұрын

That only works with D batteries, but I like your style

Lol the bonus riddle is exactly the same. Each time you test 6 batteries it will work only if the 2 remaining ones are empty! So... ORIGINAL: Finding 2 out of the 4 charged batteries, in a pool of 8 BONUS: Finding 2 out of the 4 empty batteries, in a pool of 8

I find it funny that this riddle and the temple riddle have the exact same answer; split them up into one pair and two trios.

Oh wow, this actually might be useful when dealing with battery collection catastrophes.

For the last riddle, easy! I take my newly sorted batteries and put them in. Only took one try. (I had time to sort them while the party was going on and it didnt say the baby messed it up or this was while the party was going on)

For the bonus riddle just use the old one, it takes less time and batteries.

Thee concept is so cool

Me: figures it out, then plays Also me: wait what did I answer

I use these videos as background noise for homework instead of solving them Goodbye now.

For bonus riddle, put in three groups, ABC, DEF, GH, the first group with 3 attempt leaving out AB, BC or AC, if none of that works, it means group ABC have at least 2 good batteries, try group DEF the same way, if it still not working then we know group DEF also have 2 good batteries, Then use ABCDEF for the 7th attempt, correct me if there are better solution.

Bonus 👏🏻 riddle 👏🏻

I just realized this riddle is very similar to the temple riddle

There is an alternate solution that also takes 7 tries. Divide the batteries into 4 pairs. 1. Test AB 2. Test CD 3. Test EF 4. Test AG 5. Test BG 6. Test CH 7. Test DH It will work every time.

@KineticManiac

3 жыл бұрын

This is actually the same solution phrased differently. Three groups in your solution are ABG, CDH, EF. You also have a different order for testing than shown here but that doesn't actually matter.

Drop them and if they make a small jump and sometimes are still standing then they are good.

@Stratelier

5 жыл бұрын

But you can't lift them high enough to do a good drop test.

Now that I have a giant iron I can go up the beanstalk and give an offering to the giant

The answer to the bonus riddle is also "7". we'll use the same method, but somehow oppositely since we now use 6 batteries and leave 2 every try. So we exclude two batteries (say A&B) from the tries. (So basically pin them in every try). and divide the rest into two groups (CDE - FGH). Then in every try in each group we will insert 1 battery from the Group and exclude 2. Group (CDE) Tries: 1. ABCFGH (if failed then D&E have at least 1 working) 2. ABDFGH (if failed then C&E have at least 1 working) 2. ABEFGH (if failed then C&D have at least 1 working) and if the three tries all field > then C,D&E have at least 2 working) ==>1 same goes for Group (FGH): 1. ABCDEF (if failed then G&H have at least 1 working) 2. ABCDEG (if failed then F&H have at least 1 working) 2. ABCDEH (if failed then F&G have at least 1 working) and if the three tries all field > then C,D&E have at least 2 working) ==>2 So, if if both groups have at least 2 working batteries, and there are total 4 working batteries. then each group have 2 working batteries (2+2=4) then A&B are surely not-working batteries. So the 7th try would be CDEFGH and it will surely succeed.

My solution was this: I take 4 batteries (6 possible pairs). If none of them works, there's only working batteries left and it doesn't matter which two of them I take.

@e4r281

5 жыл бұрын

wrong, it's possible you had one working battery in the first set of 4. and only 3 working batteries in the second set.

@Huonous

5 жыл бұрын

@@e4r281 Right... Thanks for pointing that out!

*BONUS RIDDLE:* Testing 6 batteries to see if there are 4 good ones in the group is equivalent to test if the two batteries you left out are bad ones. You need BOTH of these batteries to be bad in order for the iron to work. The method of testing is indirect: in order to test two batteries, you have to put the remaining 6 in the iron. If it does not light up, it means that at least one of the batteries you left out is a good one. With this in mind, we can deduce there is a big similarity with the first riddle: you can test two batteries each time, however, the iron will work when the tested ones are both bad (opposite to the first riddle, where they have to be good). Finally, we can come to the conclusion that given that there are 4 good batteries and 4 bad ones, the number of tries it takes in both riddles is the same: 7. (In order to imagine this better we can think of a ghost iron that only works with 2 bad batteries. Following the indirect method of testing described above, the riddle becomes identical to the original one) *Edit: Reading through the comments I found @Swaroop Pandit explained more or less the same thing before I even wrote this, so full credits to you as well man ;)*

This was in my Maths textbook!!! So good to see it, but I still can’t solve this thing!

After 2 days of thinking i came to a solution..a different one though. Now I came back to watch the answer.

The bonus riddle is a tricky one, if you have to get 4 out of 6 correct in the iron then you need to have 2 incorrect ones out It is same as getting 2 correct batteries out of pile of 8 (as the number of correct and incorrect batteries are the same) So the answer is 7 like the solution for the first riddle

@science_at_einstein

5 жыл бұрын

@@bobbytheduck8236 instead of putting the 2 good ones in the battery(1st riddle), you have to keep 2 bad ones out And both good ones and bad ones are equal in number

@science_at_einstein

5 жыл бұрын

@@bobbytheduck8236 now imagine this, you have a iron which only works if you put 2 bad batteries, then to choose 2. Bad battery you will choose the remaining 6 out( which is 4 good ones and 2 bad ones), so what eventually matters is choosing the batteries to keep out or in the iron

@science_at_einstein

5 жыл бұрын

@@bobbytheduck8236 how many do you put in first riddle?

@shivajigurav8204

5 жыл бұрын

It took 7 tries for me Divided it into 3 groups ABC DEF GH Now first try ABC DEF if no success the GH contains at least one Working Battery Now 2nd third and 4th try ABC GH D ABC GH E ABC GH F If still no Sucess the DEF contains 2 or 3 Working Batteries So ABC contains 0 or 1 working battery So you will for sure get result in 5th, 6th or 7th try DEF GH A DEF GH B DEF GH C ......

@lelouchyagami703

5 жыл бұрын

@@kudoamv How would you test the group of 3 individually when the iron requires 6

00:04 _He really forgot to mention the Author's name!_*

@niyathi64

4 жыл бұрын

😆

I love these riddles and the feeling you get when you solve them... What a rush. I believe people give up on themselves too quickly when attempting to solve these; don't get me wrong, they're fun to watch, but there's an extra layer of excitement when you're able to solve them. I've discovered that I am only able to solve these sorts of problems in my head. It might sound whacky, but I encourage you to try it. On paper it's easy to get hung up on the battery combinations themselves, because that's the normal approach. In your head, the problem is less stable and you can actually picture the scenario. There's one other advantage; when solving on paper, you are inclined to attempt to dive into every detail; in your head, you are more able to see the bigger picture and think conceptually. I can't be the only one this is true for. Try it out and see if you that works for you. It sounds counterintuitive, but give it a try. Find a nice relaxing spot, close your eyes, and use the power of your mind to figure out the riddle. 🤔

@NumbToons

Жыл бұрын

this is 100% the case with me as well. And I suppose, this would be the case for most people if they tried

@GabriTell

Жыл бұрын

Sht... It took me like 3 days to solve it... I feel like a frcking retərd 😔

@AW-xl6hu

Жыл бұрын

@@GabriTell I understand feeling that way, but I don't think it's true. You solved it! I've been solving riddles and puzzles for a long time, so I've learned some tips and tricks, both from the riddles I've been able to solve and the riddles I haven't been able to solve. And I've gotten a lot faster over time. The more riddles you solve the faster you'll get.

@GabriTell

Жыл бұрын

@@AW-xl6hu Thank you :') I currently took a Brilliant's course because I'm so interested in this! 👍✨

This is just a spicy version of the islanders riddle where one weighs more or less than the others.

Not to be confused with the "Iron Giant"

“Can you solve the giant iron riddle?” Me- No

Me:let’s do a riddle where I’m in charge. Ted ed:no,how about the riddle that is called GIANT IRON RIDDLE AND YOU WILL DIE TO BE THE FEAST OF GIANTS IF YOU CANT DO THIS RIDDLE

The old batteries have a different serial number on them if it’s a different battery pack. Just look at the serial numbers. Ex:if a b c d have the same serial number try a and b. If that works then... yeah iron it If it doesn’t work just try g and h.

“Can you solve the Giant Iron Riddle” No, no I can’t.

Yaaay more riddles

Deciding them in pairs of too does even works

Just for the record if I was one of the giants and came to this event to find a wrinkled shirt and a main course the size of my finger that giant throwing the party would be the next meal.