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.
calculate \sum_{i = x}^y (n \binom{y}{i} (1/n)^i ((n-1)/n)^{y-i}) when x = 3, y= 5, n = 6
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random