Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 10 - Section 10.6 - Counting Principles, Permutations, and Combinations - Exercise Set - Page 1104: 64

Answer

The number of ways for the first evening to be made is $15,120$.

Work Step by Step

We know that from the information, $\begin{align} & n=9 \\ & r=5 \\ \end{align}$ Then, we have to find the number of permutations of 9 things taken 5 at a time: $\begin{align} & {}_{9}{{P}_{5}}=\frac{9!}{\left( 9-5 \right)!} \\ & =\frac{9!}{4!} \\ & =\frac{9\times 8\times 7\times 6\times 5\times 4!}{4!} \\ & =15,120 \end{align}$ Thus, the number of ways is $15,120$.
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