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Let T(n) denote the number of triangles ...

Let `T_(n)` denote the number of triangles which can be formed by using the vertices of a regular polygon of `n` sides. If `T_(n + 1) - T_(n) = 36`, then `n` is equal to

A

2

B

5

C

9

D

8

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The correct Answer is:
D
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