Answer
See below.
Work Step by Step
${n \choose k}=\frac{n!}{k!(n-k)!}$
Hence here: ${5\choose2}=\frac{5!}{2!(5-2)!}=10$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 9 - Review Exercises - Page 679: 29
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