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 ((m+k)!/k!)^2 * (1/5)^(2k), k =1..K
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
