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Box A contains 2 black and 3 red balls, ...

Box A contains 2 black and 3 red balls, while box B contains 3 black and 4 red balls. Out of these two boxes one is selected at random, and the probability of choosing box A is double that of the probability of choosing box B. If a red ball is drawn from the selected box then find the probability that it has come from box B.

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The correct Answer is:
`10/31`
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