Question

There are n different books and m copies of each in a college library. The number of ways in which a selection of one or more books is : 

Answer 1

Correct option (d) (m + 1)ⁿ − 1

Explanation:

In the case of each book we may take 0, 1, 2, 3, ... m copies. 

∴ We may deal with each book in (m + 1) ways and therefore with all the books in (m + 1) n ways. But this includes the case where all books are rejected and no selection is made. So, the number of ways in which selection can be made 

= (m + 1)ⁿ − 1