Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
|-\frac{(-1)^1 * 1}{6^1}+\sum^{\infty}_{n=1} \frac{(-1)^n * n}{6^n}|
|-\frac{(-1)^1 * 1}{6^1}+\sum^{\infty}_{n=1} \frac{(-1)^n * n}{6^n}|
Natural Language
Math Input
Extended Keyboard
