Maths

It is observed that 1 triangle can be found in the 1st figure, 3 triangles in the 2nd figure, 6 triangles in the 3rd figure, and so on. John claims that more than 100 triangles can be found in the 15th figure? Do you agree? Explain your answer.

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asked by Max
  1. well, the nth figure has n(n+1)/2 triangles, so check it out.

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    posted by Steve

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