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.
983*189 + sum n = 1 to 982 (-1)^(n+1) * n * (1002 - n)^2
983*189 + sum n = 1 to 982 (-1)^(n+1) * n * (1002 - n)^2
Natural Language
Math Input
Extended Keyboard
