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OpenStudy (anonymous):
A bag contains 5 white and 3 black balls; another bag contains 4 white and 5 black balls . From any one of these bags, a single draw of two balls is made. Find the probability that one of them would be white ball and the other black ball.
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OpenStudy (alekos):
P (bag1) xp (w) xp (b) + p (bag2) xp (w) xp (b)
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