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.
C(5,3) * (3/20)^3*(17/20)^2
C(5,3) * (3/20)^3*(17/20)^2
Natural Language
Math Input
Extended Keyboard