Answer
$S_{n} = a_{1}\frac{1-r^{n}}{1-r}$
Work Step by Step
Look at the definition on page 824 for the formula for a finite geometric sequence.
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.3 - Geometric Sequences and Series - 11.3 Exercises - Page 795: 3
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