概率 200分黑箱,里面4个球,红黄蓝绿每次摸出一个,看完之后放回去.平均多少次能把4色球都摸到过一遍请各位注意看题,“平均多少次能把4色球都摸到过一遍”,而非“4次摸出4色球的概率”
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/29 17:38:10
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