Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 11 - Infinite Sequences and Series - 11.5 Alternating Series - 11.5 Exercises - Page 776: 34

Answer

The series converges for all values of $p$(can be any real number).

Work Step by Step

1. we will have to apply the Test of Divergence to find the value of $p$ for the given alternating series when $p\leq 0$ $\lim\limits_{n \to \infty}\dfrac{(\ln n)^p}{n}=0$ This means that the series will converge by the Test of Divergence. 2. we will have to apply the Test of Divergence to find the value of $p$ for the given alternating series when $p \gt 0$ Then $\lim\limits_{n \to \infty}\dfrac{(\ln n)^p}{n}=\lim\limits_{n \to \infty}\dfrac{p(\ln n)^{(p-1)}(1/n)}{1}=\lim\limits_{n \to \infty}\dfrac{p(\ln n)^{(p-1)}}{n}$ 3. we will have to apply the Test of Divergence to find the value of $p$ for the given alternating series when $p \leq 1$ Then $\lim\limits_{n \to \infty}\dfrac{(\ln n)^p}{n}=\lim\limits_{n \to \infty}\dfrac{p(\ln n)^{(p-1)}(1/n)}{1}=\lim\limits_{n \to \infty}\dfrac{p(\ln n)^{(p-1)}}{n}=0$ Thus, the series converges for all values of $p$( for any real number).
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