Re: AA?
I know that's the chance he has AA before the flop, but can't you go back and recalc, given the fact that you know 2 aces are gone? He'd have to have 2 specific cards (and not just 2 out of 4 specific cards). Since we have more information, you should be able to get a better chance.
Just like people say "well, there's 2 jacks on the board, so the chances of him having a jack is reduced". Since 2 aces are accounted for, the chances of them having an ace is reduced?
So, given that 5 cards are known, would the chance be 2/(47*46)?
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