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.
1 - (1 - (5^(n-7) n! / (6^n 7! (n-7)!)))^(n/2)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random