Asked by Max

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.

Answers

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