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.
(25 choose 3)(25 choose1)/(50 choose 4) + (25 choose 4)/(50 choose 4)
(25 choose 3)(25 choose1)/(50 choose 4) + (25 choose 4)/(50 choose 4)
Natural Language
Math Input
Extended Keyboard