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The prizes for a certain contest are in 5 sealed envelopes: 2 containing cash and the other 3 containing gift certificates. If 2 envelopes are to be randomly selected from the 5 envelopes, one at a time without replacement, what is the probability that at least one of the envelopes selected will contain a cash prize?
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· 相关考点
6.4.4 条件概率 7.1.1 反算思维 7.2.1 数学170神解法题
6.4.4 条件概率
7.1.1 反算思维
7.2.1 数学170神解法题
以上解析由 考满分老师提供。
