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[(9!)/((8-k)!k!)(4)^(8-k),k=1,7]]/6^9
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
