Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 11 - Counting Methods and Probability Theory - 11.3 Combinations - Exercise Set 11.3 - Page 708: 65



Work Step by Step

The number of possible permutations if r items are taken from n items is nPr =$\frac{n!}{(n-r)!}$ The number of ways that the four remaining jokes can be ranked is: = 4P4 =$\frac{4!}{(4-4)!}$ =$\frac{4!}{0!}$ =24 ways
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