+304 This problem has been bugging me for a while. There is no common ratio and I don't know if its telescopable. Help and thank you!
\(\sum_{n=1}^{\infty} \frac{n^3}{3^n}\)
+128408 Hey, DragonLord...if you send this one to heureka he might know how to fnd the result mathematically...he's pretty good with this kind of thing.....
+4609 I tried rewriting the bases as powers of three.
Then, I tried diving by three and multiplying the series by three
but it did not work.
27/27 looks very fishy, might be the key to the problem.
+304 I understand guest, but an answer to me is completely meaningless if there is no process or explanation on the way there.
