Please help!

I have 2 aces in the hole

Dealer flops 3 cards

What is my probability of hitting at least 3 aces?

2/50 + 2/49 + 2/48 = 0.12248

There are 19,600 combinations of the remaing 50 cards taken 3 at a time.

There are 2 combinations of the remaining aces

and 1128 combinations of the remaing 48 cards taken 2 at a time

2*1128 = 2256

2256/19600 = 0.1151

Why don't my numbers match up?

I'm ready to pull my hair out!

Thanks in advance