University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 9 - Section 9.4 - Comparison Tests - Exercises - Page 509: 41

Answer

Divergent

Work Step by Step

Since, we have $\Sigma_{n=1}^\infty \dfrac{2^n-n}{n 2^n}$ and $\Sigma_{n=1}^\infty \dfrac{2^n-n}{n 2^n}= \Sigma_{n=1}^\infty\dfrac{2^{n}}{n2^n} -\Sigma_{n=1}^\infty\dfrac{n}{n2^n}$ or, $=\Sigma_{n=1}^\infty\dfrac{1}{n} -\Sigma_{n=1}^\infty (\dfrac{1}{2})^n$ Thus, the series $\Sigma_{n=1}^\infty\dfrac{1}{n}$ is a divergent p-series with $p=1$ and $\Sigma_{n=1}^\infty (\dfrac{1}{2})^n$ is a convergent series because it is a geometric convergent series with common ratio $r =\dfrac{1}{2} \lt 1$ Hence, the sum of the two series diverges.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.