A bag contains 4 white, 7 black and 5 re...

A bag contains 4 white, 7 black and 5 red balls. Three balls are drawn one after the other without replacement. Find the probability that the balls drawn are white, black and red respectively.

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If P(A)7/(13),P(B)=9/(13) and P(AnnB)=4/(13), find P(A/B)dot
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