The library is to be given 5 books as a gift. The books will be selected from a list of 20 titles. If each book selected must have a different title, how many possible selections are there?
A) 3,200,000
B) 100
C) 15,504
D) 1,860,480

Question

Quizplus · Accepted Answer

The number of ways to select 5 books from 20 different titles is given by the combination formula C(n, k) = n! / (k!(n-k)!), where n is the total number of titles and k is the number of books to select. Here, C(20, 5) = 20! / (5! * 15!) = 15,504.

The Library Is to Be Given 5 Books as a Gift