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((binomial(n-1,k)*(b-2)^(n-1-k))/(1+k+a*(n-1-k)),k=0..n-1)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random