Answer
$42$
Work Step by Step
We know that $P(n,r)=\dfrac{n!}{(n-r)!}.$
Hence,
$P(7,2)=\dfrac{7!}{(7-2)!}=\dfrac{7\cdot6\cdot5!}{5!}=7\cdot6=42$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 13 - Counting and Probability - 13.2 Permutations and Combinations - 13.2 Asses Your Understanding - Page 855: 8
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