I'm a little confused by summations and closed forms...
Can someone explain how the heck this works...
$\displaystyle \sum_{i=1}^{n}n-i+2$
By re-arranging the terms, this becomes:
$\displaystyle \sum_{i=1}^{n}i+1$
Check this out, hopefully you can apply the same logic to your problem:
Summations