Answer
$\sum_{k=1}^{n}\ ar^{k-1}$
Work Step by Step
Based on the given summation, we have the sum as $\sum_{k=1}^{n}\ ar^{k-1}$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 11 - Sequences; Induction; the Binomial Theorem - Section 11.1 Sequences - 11.1 Assess Your Understanding - Page 827: 68
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