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.
fit {(0,1/5),(1,1/15),(2,1/45),(3,1/81)}
fit {(0,1/5),(1,1/15),(2,1/45),(3,1/81)}
Natural Language
Math Input
Extended Keyboard