名校
1 . 在一次随机试验中,三个事件
,
,
的概率分别为0.2,0.3,0.5,则下列说法正确的个数是( )
①
与
是互斥事件,也是对立事件;
②
是必然事件;
③
;
④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2646f41226f24960a6186dc7860ef45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04b56e44e4f0424a2b7a45567120a2e4.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58a09d3d15632b31823ec5bc9a8c295d.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7091583897d6bf031b198c54823b4fa0.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d14e16b6595d3a31c93beed446ebff6b.png)
A.4 | B.1 | C.2 | D.3 |
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2020-03-05更新
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553次组卷
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2卷引用:天津市第四十二中学2019-2020学年高一下学期期中理科数学试题