I tried this. Here is my results using Aces.

50*49*48=117600 total possible flops.

AAx = happens 48 times
AxA = happens 48 times
xAA = happens 48 times

144 ways two Aces can come up in 117600 flops.
144/117600 I get 3/2450. [img]/forums/images/icons/confused.gif[/img]

Where does my logic fail? And what does (50 choose 3) and (2 choose 2) and (48 choose 1) mean?