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# books

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 a student selects atleast one book is 63 then the value of n is

Note by Gopal Chpidhary
3 years, 10 months ago

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n=3.

- 3 years, 10 months ago

n=3

- 3 years, 10 months ago

- 3 years, 10 months ago

Do you know? If yes.Then why are you asking for it? If no here you go: for selecting k books from 2n+1 books number of ways is: 2n+1 C k. Like that we can say required answer is (2n+1 C 0)+(2n+1 C 1)+.........(2n+1 C n)-1=(2^(2n+1)/2)-1=63 =>n=3.

And please try to post better problems.

- 3 years, 10 months ago