1 . 已知
,当
时,
与
视为不同的对,则这样的
对的个数有_____ 个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2c04cd095ee0f284135b1112930621d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb584b83ae783a0ec8a9b4628b7fca3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41be4f4fbf21555f325caf280c392c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7113de81db260e6666292f39b447b848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41be4f4fbf21555f325caf280c392c00.png)
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2019-01-28更新
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324次组卷
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2卷引用:5.1.2计数原理的简单应用 课时作业2021-2022学年高二上学期数学北师大版(2019)选择性必修第一册