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题目内容双击单词支持查询和收藏哦～
In a box of 40 blues balls and 20 red balls, someone randomly selects balls twice without replacement. What is the probability that both balls are blue?
Give your answer as a fraction.
78 /177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。
