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Practical Poker Math

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Flush Draw & Low Draw >>> Flush or Low<br />

With a Flush draw and a Low draw there are 16 low cards<br />

that will complete the Low. 4 of these are of the same suit as<br />

the draw, so there are 16 + 5 = 21 cards that will make either<br />

the Flush or the Low. 21 of the unseen 45 cards will make the<br />

Flush or the low and 24 will not.<br />

21 * 24 = 504 is the number of 2-card combinations, one<br />

card of which will make either the Flush or the low.<br />

Comb(21, 2) is the number of 2-card combinations that<br />

contain 2 cards both of which can make either the Flush or<br />

the low:<br />

(21 * 20) = 210<br />

(1 * 2)<br />

504 + 210 = 714 possible 2-card combinations WILL make<br />

the Flush:<br />

Total Possibilities = 990<br />

– WILLs = 714<br />

WILLNOTs = 276<br />

Odds of a Flush or a Low with 2 Cards to Come<br />

WILLNOTs : WILLs<br />

276 : 714<br />

Reduce<br />

276 / 714 : 714 / 714<br />

.4 : 1<br />

WILLs<br />

* 100 = Probability as %<br />

Total Possibilities<br />

714 * 100 = 72%<br />

990<br />

209<br />

After the Flop

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