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Old 12-22-2003, 03:41 PM
Robk Robk is offline
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Join Date: Oct 2002
Location: Chicago
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Default Re: Probability: Three-flush to Flush

The probability of making your flush with two cards to come is 1 - P(none of your suit come) = 1 - (38/47)*(37/46) = 1-.65 = .35, or about 1.86:1.

The probability of making a runner-runner flush is just the product of the probabilities of one of your suit coming on each of the next two cards = (10/47)*(9/46) = .0416.

P.S. You seem to have a fundamental misunderstanding about odds and probability. You wrote that the odds against hitting a flush card on the river are 37:9, which is correct. But the probability you make your hand is 9/(37 + 9), NOT 9/37.
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