Answer
See the explanation below.
Work Step by Step
$n!$ defines all the numbers starts from $n$ and ends at $1$. Let us take an example $3!$
$3!= 3 \cdot 2 \cdot 1=6$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Section 11.1 - Sequences and Summation Notation - Exercise Set - Page 830: 64
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