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

Urn A contains 1 white, 2 black and 3 red balls, urn B contains 2 white, 1 black and 1 red ball, and urn C contains 4 white, 5 black and 3 red balls. One urn is chosen at random and two balls are drawn. These happen to be one white and one red. What is the probability that they come from urn A ?

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The correct Answer is:
`(33)/(118)`
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