Answer
15
Work Step by Step
$\frac{6!}{2!(6-2)!}=\frac{6\times5\times4!}{2!\times4!}=\frac{6\times5}{2\times1}=15$
Statistics (12th Edition)
by McClave, James T.; Sincich, Terry T.
Published by
Pearson
ISBN 10:
0321755936
ISBN 13:
978-0-32175-593-3
Chapter 4 - Discrete Random Variables - Exercises 4.50 - 4.76 - Learning the Mechanics - Page 204: 4.53a
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