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[" There are two bags,one of which conta...

[" There are two bags,one of which contains "3" black and "4" white balls,and the other contains "4" black "],[" and "3" white balls.A fair dis cast.If the face "1" or "3" turns up,a ball is chosen from the first bag,and "],[" if any other face turns up,a ball is chosen from the second bag.Find the probability of choosing a "],[" black ball."]

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