from n=1 to infinity of
((-1)^n * n)/3^n
does it converge or diverge, and what is the sum?
Follow Math Help Forum on Facebook and Google+
It's convergent by the alternating series test. while .
Last edited by disclaimer; April 24th 2008 at 09:14 AM.
We have: . . . .
Add:. . . . . . . . . The series has the sum: .
And we have: .
View Tag Cloud