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Both box T and box U have some white balls and black balls. There are 20 white balls and 30 black balls in box T. If a person selects 1 ball randomly from each box, then the probability that both balls are white is 0.25. What is the probability of selecting a black ball from the box U?
Give your answer as a fraction.
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· 相关考点
6.4.3 独立事件 6.4.2 互斥事件与对立事件
6.4.3 独立事件
6.4.2 互斥事件与对立事件
以上解析由 考满分老师提供。
