from n=1 to infinity of
((-1)^n * n)/3^n
does it converge or diverge, and what is the sum?
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It's convergent by the alternating series test. while .
Last edited by disclaimer; Apr 24th 2008 at 10:14 AM.
We have: . . . .
Add:. . . . . . . . . The series has the sum: .
And we have: .
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