英语概率题求助!A student estimates that the probability of hispassing Chemistry or English is 0.8,the probabilityof his passing Chemistry is 0.7,but hisprobability of passing both is 0.5.What shouldbe his estimate of the probability of his pas
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![英语概率题求助!A student estimates that the probability of hispassing Chemistry or English is 0.8,the probabilityof his passing Chemistry is 0.7,but hisprobability of passing both is 0.5.What shouldbe his estimate of the probability of his pas](/uploads/image/z/4328932-4-2.jpg?t=%E8%8B%B1%E8%AF%AD%E6%A6%82%E7%8E%87%E9%A2%98%E6%B1%82%E5%8A%A9%21A+student+estimates+that+the+probability+of+hispassing+Chemistry+or+English+is+0.8%2Cthe+probabilityof+his+passing+Chemistry+is+0.7%2Cbut+hisprobability+of+passing+both+is+0.5.What+shouldbe+his+estimate+of+the+probability+of+his+pas)
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