- #1
knowLittle
- 312
- 3
Homework Statement
##\sum _{n=1}^{\infty }\dfrac {\left( -3\right) ^{n}} {n^{3}}##
According to Wolfram Alpha the series diverges by the Limit Comparison Test, but I remember that the limit comparison only works with series greater than zero. How is this possible?
Homework Equations
The Attempt at a Solution
Also, I have no clue how to use the alternating series test on this one, since it's (-3)^n in the numerator not (-1)^n or (-1)^n+1
Please, help.