There are 2 bags one of which contains 3 black and 4 white balls, while the other contains 4 black and 3 white balls. A die is cast, if face 1 or 3 turns up a ball in taken from the 1st bag and if any other face turns up a ball is taken from the second bag. The probability of choosing a black ball is
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probability is 1/2
may be
may be
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