Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 11 - Infinite Sequences and Series - 11.4 Exercises - Page 751: 38

Answer

$\Sigma_{n=2}^{\infty}\frac{1}{n^{p} ln(n)}$ converges if $p\gt 1$

Work Step by Step

Clearly, if $p\lt 0$, then the series converges, since $\lim\limits_{n \to \infty}\frac{1}{n^{p}ln n}=\infty$ if $0\leq p\leq 1$, $n^{p}ln (n)\leq n ln (n)$ and $\Sigma_{n=2}^{\infty}\frac{1}{n ln(n)}$ diverges. So, $\Sigma_{n=2}^{\infty}\frac{1}{n^{p} ln(n)}$ converges if $p\gt 1$
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