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Example: Find out the radius of convergence for the following power series.
Solution:
Therefore, in this case we have,
an = ((-3)n)/(n7n+1)
an+1 = ((-3)n+1)/(n7n+2)
Keep in mind that to calculate an+1 all we do is replace all the n's in an along with n+1. By using the ratio test then provides,
= (3/7) |x -5|
Here we know that the series will converge if,
(3/7) |x -5| < 1 ⇒ |x -5| < 7/3
As well as the series will diverge if,
3/7) |x -5| > 1 ⇒ |x -5| > 7/3
Conversely, the radius of the convergence for the series is,
r = 7/3
1x1
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