Answer
$_6C_4=15$
Work Step by Step
$_nC_r=\frac{n!}{(n-r)!~n!}$
$_6C_4=\frac{6!}{(6-4)!~4!}=\frac{6\times5\times4!}{2!~4!}=\frac{30}{2}=15$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11824 - 11.6 - Counting Principles - 11.6 Exercises - Page 824: 49
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