Answer
$\frac{n!}{r!(n-r)!}$
Work Step by Step
Look at the definition on page 854 to discover the correct answer to the question.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.6 - Counting Principles - 11.6 Exercises - Page 823: 6
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