College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 10 - Section 10.2 - Permutations and Combinations - 10.2 Assess Your Understanding: 8

Answer

42

Work Step by Step

Use the permutation formula to obtain: $P(n,r)=\frac{n!}{(n-r)!}$ $P(7,2)=\frac{7!}{(7-2)!}=\frac{7\cdot6\cdot5!}{5!}=42$
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