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Four slips of paper are numbered 1, 2, 3, and 4, respectively and put into an empty box. If two of these slips of paper will be drawn out of the box at random and without replacement, what is the probability that the sum of the two numbers written on the slips of paper will be 3?
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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。
