Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 10 - Section 10.6 - Counting Principles, Permutations, and Combinations - Exercise Set - Page 1104: 52

Answer

The number of ways to select 6 people out of 14 standbys are $3003$

Work Step by Step

We know that: ${}_{n}{{C}_{r}}=\frac{n!}{r!\left( n-r \right)!}$ From the information, $\begin{align} & n=14 \\ & r=6 \\ \end{align}$ Then to find the number of combinations of 14 things taken 6 at a time, apply the above formula: $\begin{align} & {}_{14}{{C}_{6}}=\frac{14!}{6!\left( 14-6 \right)!} \\ & =\frac{14!}{6!8!} \\ & =\frac{14\times 13\times 12\times 11\times 10\times 9\times 8!}{\left( 8! \right)\times 6\times 5\times 4\times 3\times 2\times 1} \\ & =3003 \end{align}$ Thus, there are $3003$ ways to select 6 people out of 14 standbys.
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