Answer
$_{12}C_3=220$
Work Step by Step
$_nC_r=\frac{n!}{(n-r)!\times r!}$
$_{12}C_3=\frac{12!}{(12-3)!\times3!}=\frac{12\times11\times10\times9!}{9!\times3!}=\frac{12\times11\times10}{3\times2\times1}=2\times11\times10=220$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - Review Exercises - Page 841: 78
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