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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?
Give your answer as a fraction.
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· 相关考点
6.4.4 条件概率
6.4.4 条件概率
以上解析由 考满分老师提供。
