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Question

A student is allowed to select at most ‘n’ books from a collection of (2n+1) books. If the total number of ways in which he can select at least one book is 63 then n =
  1. 6
  2. 4
  3. 5
  4. 3


Solution

The correct option is D 3
By verification
(i)n=3;2n+1=77C1+7C2+7C3=63
So Ans = (i)

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