Calculus 8th Edition

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

Chapter 11 - Infinite Sequences and Series - 11.4 The Comparison Tests - 11.4 Exercises - Page 771: 9

Answer

Diverges

Work Step by Step

The Comparison Test states that the p-series $\sum_{n=1}^{\infty}\frac{1}{n^{p}}$ is convergent if $p\gt 1$ and divergent if $p\leq 1$. We can use the Comaprsion Test since both series are clearly positive. The left series is always larger than the right because $lnk$ is greater than $1$, the numeraror of $1/k$ , once $k$ reaches $3$. Therefore, $\Sigma_{k=1}^{\infty} \frac{lnk}{k}\geq \Sigma_{k=1}^{\infty} \frac{1}{k} $ for $k\geq 3$ Since, $1/k$ ia s p-series with $p\leq 1$ , the series on the right diverges, and therefore, the series on the left diverges.
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