Algebra and Trigonometry 10th Edition

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

Chapter 11 - Review Exercises - Page 840: 8



Work Step by Step

As we can see the numerator in each term is $1$ while the denominator in each term is $n$. Also the signs are alternating starting with a positive one at the first term, thus a general formula is: $a_n=(-1)^{n+1}\frac{1}{n}$.
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