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.
f(N) = (1/(N+1)) * SUM(0..N)((1/2)
f(N) = (1/(N+1)) * SUM(0..N)((1/2)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
