Answer
See below.
Work Step by Step
The exponent of $a$ decreases in every term, going from $n$ to $0$.
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 11.3 - Geometric Sequences and Series - Exercise Set - Page 858: 124
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