<PRE><B>Question 696164</B>
an urn contain 7 red marbels and 3 white marbels, 3 marbels drawn from the urn one after another find the probality that first 2 are red and 3rd is white if
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condition a::: marbels drawn are replaced after every draw
(7/10)^2(3/10) = 0.147 
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condition b::: marbels drawn are not replaced after every draw
(7C2/10C2)(3/8) = 0.175
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Cheers,
Stan H.
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