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.
limit sum ((2k-1)/2^k,k->1..n), n->oo
limit sum ((2k-1)/2^k,k->1..n), n->oo
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random