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 - (1 - k/r)^d, for k=100 r=2000 d=2^n
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random