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Math 102 — Power series
Summary. Try each of the following problems together in a small group.
Problem 1. For each of the following power series, find the interval and radiusof convergence. Remember, you’ll use the ratio test first, and then work withthe endpoints of the interval separately.
a.P1
n=1(5x)n
n
b.P1
n=1(�1)n (x�2)npn5n
c.P1
n=1(�1)n (x+3)n
n22n
d.P1
n=122nx2n
n3
e.P1
n=1(�1)n x2n+1
(2n+1)!
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