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Q.

Rakshit is allowed to select (n + 1) or more books out of (2n +1) distinct books. If the number of ways in which he may not select all of them is 255, then value of n is

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a

3

b

4

c

5

d

11

answer is B.

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Detailed Solution

Use 2n+1Cn+1+2n+1Cn+2+…+2n+1C2n=22n−14n-1=255⇒4n=256⇒n=4

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