Answer
$a.\quad 120$
$b.\quad 6$
Work Step by Step
Arrangements are permutatitons. $P(n,r)=\displaystyle \frac{n!}{(n-r)!}$
$a.$
$r=5,n=5$
$P(5,5)=5!=120$
$b.$
$r=3, n=3$
$P(3,3)=3!=6$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 11 - Further Topics in Algebra - 11.6 Basics of Counting Theory - 11.6 Exercises - Page 1062: 51
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