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题目内容
A telephone system has $$n$$ telephone lines. For each of the $$n$$ lines, the event that the line will fail during a certain reliability test has probability 0.3, and these $$n$$ events are independent. If the probability that at least one of the n lines will not fail during the reliability test is greater than 0.99, what is the minimum value of $$n$$?
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· 相关考点
6.4.3 独立事件
6.4.3 独立事件
以上解析由 考满分老师提供。