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There are 10 pens in a box, and 2 of the pens are defective. If 2 pens are to be selected at random from the box without replacement, what is the probability that neither will be defective?
Give your answer as a fraction.
28 /45显示答案
· 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。
