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: 11

Answer

First five terms: $0, \frac{\ln2}{2}, \frac{\ln3}{3}, \frac{\ln4}{4}, \frac{\ln5}{5}$. This sequence converges to $0$.

Work Step by Step

Putting the values of $n={1,2,3,4,5}$ in $\frac{\ln n}{n}$ leads to the first five terms of the sequence. Note: $\ln 1 = 0$. The limit $\lim_{n\to\infty} \frac{\ln n}{n}$ is of $\frac{\infty}{\infty}$ form. Using L’Hôpital’s rule, $$\lim_{n\to\infty} \frac{\ln n}{n} = \lim_{n\to\infty} \frac{1}{n}=0$$. Thus the sequence converges to $0$.
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