Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 11 - 11.1 - Sequences and Series - 11.1 Exercises - Page 777: 44



Work Step by Step

The signs are alternating (starts with positive). The numerator is always $1$ and the denominator starts at $2$ and is multiplied by $2$ at each term. Thus a general term is $a_n=(-1)^{n+1}\frac{1}{2^n}$
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