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.
(4 + 2 + 1)!/(4! 2! 1!)
(4 + 2 + 1)!/(4! 2! 1!)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random