已知集合
,
,则
的非空真子集个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450b0e7d279fc054423855a188739546.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb7b64fbde53d0fbbc2c10898ffd57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81919684bc4047d376c7e57dc6c8f1c.png)
A.5 | B.6 | C.7 | D.8 |
更新时间:2022-05-27 14:31:38
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【推荐1】已知集合
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