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.
(6!-(5!+5!-4!+5!-4!-3!+5!-4!-3!-2!))/(6!)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random