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 ( (C(48,9)*C(40,j))/C(88,9+j) * 39/(88-9-j)), j=0 to n-1
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random