Question

Debbie is borrowing 3 books from her friend who has a collection of 45 books. Which of the following expressions represents the number of ways Debbie can choose a group of 3 books?

A.) P(45, 3)
B) C(45, 3)
C) 45!

Answer 1

C(45, 3)

Explanation:

Answer 2

As we observe clearly the problem given, it is clear that the order in which Debbie would choose the 3 books out of the total of 45 books is not important. This makes the problem an example of a Combination problem. The answer to this item is therefore letter B. C(45,3) read as combination of 45 taken 3.