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.
(1/8)*((5^6)/6 - (5^4)/2 + 2*5^2)
(1/8)*((5^6)/6 - (5^4)/2 + 2*5^2)
Natural Language
Math Input
Extended Keyboard