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15问答网 > 1到11中选5个选中1和2的概率是多少?怎么算

1到11中选5个选中1和2的概率是多少?怎么算

2025-04-04 15:33:11

推荐回答（3个）

回答1：

这个题目是一个组合题不存在哪个数先选哪个数后选到的情况
如果是同时含有1、2 那么就要在剩余9个数中选出3个C9(3) 11个数中选5个的可能为C11(5) 所以同时选中1和2的概率为C9(3)/C11(5)=2/11

回答2：

斜　　女性，人类用尽美好的字眼赞美你，沉蕊--~~-

回答3：

此动作要求进攻队员动作协调

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