Questions
Rakshit is allowed to select or more books out of distinct books. If the number of ways in which he may not select all of them is 255, then value of n is
detailed solution
Correct option is B
Use 2n+1Cn+1+2n+1Cn+2+…+2n+1C2n=22n−14n-1=255⇒4n=256⇒n=4Similar Questions
is equal to
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