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-(((45 binom 0)(455 binom 50))/(500 binom 50)+ ((45 binom 1)(455 binom 49))/(500 binom 50))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random