approximating pot odds for a hand

[Notorious G.O.B.]

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I think you’ve got some kind of misconception about all this. I don’t have time now though, so I’ll get back to you tomorrow.

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He's basically correct regarding hold'em odds, although it falls apart around 13 outs or so. Every out gives you an extra 4% to win with two cards to come, 2% with one card to come.
Since the number of unknown cards vary, I doubt there is any similar trick in stud.