Answer
$\frac{a}{1-b^2} $
Work Step by Step
Since $|b|\lt 1$ so is $b^2$ Thus the sum is $\frac{a}{1-b^2} $
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter 8, Sequences and Series - Chapter 8 Review - Exercises - Page 641: 60
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