Answer
1
Work Step by Step
$1!$ = $1$ as a factorial signifies multiplying all natural numbers less than or equal to the argument. Thus, $1!$ is equal to 1.
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 10 Counting Methods and Probability - 10.1 Apply the counting Principles and Permutations - 10.1 Exercises - Skill Practice - Page 687: 20
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