Calculus: Early Transcendentals (2nd Edition)

Published by Pearson
ISBN 10: 0321947347
ISBN 13: 978-0-32194-734-5

Chapter 8 - Sequences and Infinite Series - 8.5 The Ratio, Root, and Comparison Tests - 8.5 Exercises - Page 648: 63

Answer

Converges

Work Step by Step

We have: $a_k=\dfrac{1}{k^{\ln k}}$ and $b_k=\dfrac{1}{k^2}$ We can see that for $\dfrac{1}{k^{\ln k}} \lt \dfrac{1}{k^2}$ on $(e^2, \infty)$. But $b_k=\dfrac{1}{k^2}$ corresponds to a convergent p-series. Therefore, the series converges by the comparison test.
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