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Let Tn denote the number of triangles wh...

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=28`, then n equals a)4 b)5 c)6 d)8

A

4

B

5

C

6

D

8

Text Solution

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The correct Answer is:
D
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