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Urn A contains 2 white, 1 black and 3 re...

Urn A contains 2 white, 1 black and 3 red balls, urn B contains 3 white, 2 black and 4 red balls and urn C contains 4 white, 3 black and 2 red balls. One urn is chosen at random and 2 balls are drawn at random from the urn. If he chosen balls happen to be red and black, what is the probability that both balls come from urn B?

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