Answer
$120$
Work Step by Step
The positive integers from $5$ down through $1$ are $5,4,3,2,1$. Thus for $n=5$ this means $5\cdot4\cdot3\cdot2\cdot1=120$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 7 - Conic Sections - Exercise Set 7.3 - Page 701: 93
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