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.
SUM((9/10)^(k-1)*1/10, k,1,10)
SUM((9/10)^(k-1)*1/10, k,1,10)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random