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1 . 在本场考试中,多选题可能有
个或
个正确的选项,全部选对得
分,漏选得
分,有选错或未选的得
分.如果你因完全不会做某道题目而必须随机选择
项选项,设该题恰有两个正确选项的概率为
,你的得分为随机变量
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5332ae9dc9d9c4cff2ac5262714d899c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3606c4a853a6a34cb7f33bea81b15a1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
A.若随机选择两项,则存在![]() ![]() |
B.无论![]() ![]() |
C.若![]() |
D.若随机选择三项,则存在![]() ![]() |
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