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 C(1000,i) * 1 / 2^1000, i from 469 to 531) - 0.95
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random