已知集合
, 若
, 则集合
的子集个数为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc17d36632bfebfcf789695ec096d405.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7201dbbce3baf200a5a39c62f607e9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1776b727546449fce9c6a4f891cacb.png)
更新时间:2022-12-20 11:28:38
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