Answer
$\sum_{i=1}^{n}ar^{i-1}$
Work Step by Step
Since, we have $a+ar+ar^2+...ar^{n-1}$
This can be summed up with the summation notation as:
$\sum_{i=1}^{n}ar^{i-1}$
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 829: 42
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