Calculus, 10th Edition (Anton)

Published by Wiley
ISBN 10: 0-47064-772-8
ISBN 13: 978-0-47064-772-1

Chapter 9 - Infinite Series - 9.1 Sequences - Exercises Set 9.1 - Page 605: 13

Answer

First five terms: $0,2,0,2,0$. This sequence does not converge.

Work Step by Step

$(-1)^n$ is $-1$ when $n$ is odd and it is $1$ when $n$ is even, thus giving us $1-1=0$ for every odd term and $1+1=2$ for every even term. The sequence diverges because the terms of the sequence are oscillating between $0$ and $2$ and the limit, $$\lim_{n\to\infty}{1+(-1)^n}$$ does not exist. Thus, the sequence does not converge.
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