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 (4 choose i)*(-1)^(i+1) * (8-2*i)!^2 / 8!^2 for i from 1 to 4
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random