Very hard problem | Count all triangles | Total Number of triangles

Very hard problem | Count all triangles | Total Number of triangles | PRMO RMO INMO IMO NMTC NTSE

#VeryHard #ExtremelyHard #InsanelyHard #IMO #RMO #PRMO #INMO #Geometry #Triangles #TriangularNumbers #SumOfTriangularNumbers #SumOfSquareNumbers #SumOfOddSquareNumbers #SumOfNaturalNumbers
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