Answer
21
Work Step by Step
7C2
Write as factorials: $\frac{7!}{2!5!}$
Expand: $\frac{7\times6\times5\times4\times3\times2\times1}{2\times1\times5\times4\times3\times2\times1}$
=42/2
=21
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 11 - Probability and Statistics - Chapter Review - Page 752: 9
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