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.
summation combination(m+N-k-2,N-k) * k / ( N * combination(m+N-1,N) ) from k =1 to N
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random