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Q.

A student is allowed to select at most ‘n’ books from a collection of (2n + 1) books. If the total no. of ways in which he can select one or more books is 63, then n is

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a

1

b

2

c

3

d

4

answer is C.

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Detailed Solution

22n−1=63 ⇒22n=64⇒2n=6 ⇒n=3

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