How do you do math for draw and stud games?

[Jack Bando]

How do you calc the odds of getting the card you need when you draw or in stud when you can see so many cards out?

[soko]

(number of cards in the deck - number of cards you've seen) / number of cards you need to improve

[BruceZ]

[ QUOTE ]
(number of cards in the deck - number of cards you've seen) / number of cards you need to improve

[/ QUOTE ]

Subtract 1 from this number to get the odds against making your hand when drawing 1 card. If you don't subtract 1, then you get the probability X as in "1 in X". The denominator is the number of unseen cards that would make your hand, aka "outs".