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.
sum e^(-cx)c^k(x-a)^k/((k+m)(k-1)!) from k=1 to k=inf
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random