As a hint for you guys, I won't say exactly how to do it, but to check to see if you are right:
1,267,650,600,228,229,401,496,703,205,275 different sets. Anyone want to confirm? I got a heck of a hand cramp writing them all down.
yep, i got approximately the same answer. (a.k.a. 2^100 - 100, and that's much easier to write!)
