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JEE Main 2013

JEE Main 2013 Mathematics question on Permutations and Combinations

Let TnT_n be the number of all possible triangles formed by joining vertices of an nn-sided regular polygon. If Tn+1−Tn=10T_{n+1} - T_n = 10, then the value of nn is
  1. A.
    7
  2. B.
    5
  3. C.
    10
  4. D.
    8
Show answer

Correct option: B

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