Question

The library is to be given 7 books as a gift. The books will be selected from a list of 15 titles. If each book selected must have a different title, how many possible selections are there?

Answer 1

To find the number of possible selections, we need to use the concept of combinations. The number of possible selec

Step-by-step explanation:

To find the number of possible selections, we need to use the concept of combinations. When selecting books with different titles, order does not matter. The number of possible selections can be calculated using the formula for combinations: nCr = n! / (r!(n-r)!), where n is the total number of titles (15) and r is the number of books to be selected (7).

Plugging in the values, we have 15C7 = 15! / (7!(15-7)!) = 6435 possible selections.