Trang 694 11.2 21-34.Determine whether the series is convergent or divergent. If it is convergent,
find its sum.
21.
1
2n
n 1
22.
n 1
2n 3
n 1
k2
23. 2
k 2 k 1
24.
k (k 2)
(k 3)
k 1
2
1 2n
n
n 1 3
25.
11.8 3-28. Find the radius of convergence and interval of convergence of the series.
3.
n 1
xn
n
4.
(1)n x n
n 1
n 0
5.
(1)n1 x n
n3
n 0
6.
nx n
n 1
7.
xn
n 1 n !
0
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