0 votes 0 votes 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, find the value of n. (a) 4 (b) 3 (c) 5 (d) 6 bharti asked May 19, 2017 bharti 504 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply sid1221 commented May 19, 2017 reply Follow Share is it 3 ? 0 votes 0 votes bharti commented May 19, 2017 reply Follow Share yup it is option B 0 votes 0 votes Please log in or register to add a comment.
Best answer 2 votes 2 votes as we know that .. row summation $\left ( n r \right )$ = 2 ^{n}$ so here given no of ways in which he can select at least one book is 63 , it is nothing but selecting 1 book to atmost n books as given in question , from collection of 2n+1 sid1221 answered May 19, 2017 selected May 19, 2017 by bharti sid1221 comment Share Follow See all 0 reply Please log in or register to add a comment.