Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 11 - Counting Methods and Probability Theory - 11.3 Combinations - Exercise Set 11.3: 52

Answer

20 groups

Work Step by Step

The order of the chosen employees does not matter. Combinations: ${}_{n}C_{r}=\displaystyle \frac{n!}{(n-r)!r!}$ ${}_{6}C_{3}=\displaystyle \frac{6!}{(6-3)!3!}=\frac{6\times 5\times 4}{1\times 2\times 3}=20$
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