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【简答题】
在某工厂有甲乙丙三台机器生产螺丝刀,它们的产量各占25%,35%,40%,正品率分别为95%,96%,98%, (1)从中任取一个,求它是次品的概率; (2)今从中任取一个,发现是次品,问该次品是甲台机器生产的概率。
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