Answer
$r=-1$, geometric,
$S_{50}=0$
Work Step by Step
Based on the given series, we have $r=-1$, it is geometric,
$S_{50}=\frac{-3((-1)^{50}-1)}{-1-1}=0$
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 11.3 Geometric Sequences; Geometric Series - 11.3 Assess Your Understanding - Page 845: 82
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