sum_j=1^32 [ (-1)^(j-1) * (32 choose j) * 1/(1- ((32-j) choose 2)/(32 choose 2) ) ]

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.