4 balls are drawn from an urn contains 5 black and 3 white balls and are put in an empty urn then two balls are drawn from this urn at random.it was found that the balls drawn are both white if the third ball is drawn from this urn what is the probability of its being white ? If the third ball is found to be black, what is the probability that 3 white and 1 black ball was drawn originally?
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refer to the attachment
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P(E) = (225 + 9 + 189)/ 780 = 354/780
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