1 . 若
是全集
的一个非空子集,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4411598e6ff48451beba0dcf3131e460.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4411598e6ff48451beba0dcf3131e460.png)
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2 . 若
,则
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/750323bb31800fd98396e7d4027ef1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0331c73469747f462c630745e20d05f.png)
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3 . 从
这五个数中任取两个数,其和为偶数的概率为
.( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5969a26e4b3c149f694f857c655b08be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
您最近一年使用:0次