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.
30 + sum of r / (100 - r) for r=1..30
30 + sum of r / (100 - r) for r=1..30
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random