# Intervals of ConvergenceIn Exercise , (a) | Ch 10.7 - 28E ## Problem 28E Chapter 10.7

Thomas' Calculus: Early Transcendentals | 13th Edition

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Problem 28E

Intervals of Convergence

In Exercise , (a) find the series’ radius and interval of convergence. For what values of x does the series converge (b) absolutely, (c) conditionally? Step-by-Step Solution:

Step 1 of 5</p>

Here, we have to find

The series’ radius and interval of convergence.The value of x for which the series converges absolutely.The value of x for which the series converges conditionally. .

Let us use the ratio test in order to find the radius of convergence.

Therefore, according to the ratio test, a series is said to be absolutely convergent if …..(1)

Therefore, according to our question, we have .

Thus,    Thus, using (1), we have …..(2)   Therefore, we get .

Therefore, we get the radius of convergence as and the center is .

Step 3 of 5</p>

Now let us test the convergence of the series at the endpoints.

At , we have the series as  , which is a divergent series using the nth term test for divergence.

At , we have the series as  , which is a divergent series using the nth term test for divergence.

Step 4 of 5

Step 5 of 5

##### ISBN: 9780321884077

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