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.
a*c=1/3, b*c+a*d=1/3, b*d=1/3
a*c=1/3, b*c+a*d=1/3, b*d=1/3
Natural Language
Math Input
Extended Keyboard
