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题目内容
There are 7 balls in a box, among which 1 is red. Someone removes balls from the box one by one without replacement and stops until he or she removes the red ball.
Quantity A
The probability that he or she stops after the third removal
Quantity B
The probability that he or she stops after the fourth removal
C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。