Discrete Mathematics with Applications 4th Edition

Published by Cengage Learning
ISBN 10: 0-49539-132-8
ISBN 13: 978-0-49539-132-6

Chapter 5 - Sequences, Mathematical Induction, and Recursion - Exercise Set 5.1 - Page 244: 75



Work Step by Step

$=\frac{n!}{(n-1)!(n-n+1)!}$ $=\frac{n!}{(n-1)!}$ $=\frac{(n-1)!n}{(n-1)!}$ $=n$
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