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Eamcet Mathematics
Algebra Permutations And Combinations

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Let T_n denote the number of triangles which can be formed using the vertices of a regular polygon of n sides. If T_n+1 - T_n = 21 then n equals

A. 5

B. 7

C. 6

D. 4

E. None of the above

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Correct choice: B

Explanation:

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Eamcet Mathematics Algebra Permutations And Combinations

Eamcet Mathematics
Algebra Permutations And Combinations