有5个男生和3个女生,从中选出5人担任5门不同学科的课代表,求分别符合下列条件的选法数:
(1)某女生一定担任语文课代表;
(2)某男生必须包括在内,但不担任数学课代表.
(1)某女生一定担任语文课代表;
(2)某男生必须包括在内,但不担任数学课代表.
更新时间:2023-08-08 21:16:08
|
【知识点】 元素(位置)有限制的排列问题解读
相似题推荐
【推荐1】从
名运动员中选出
人参加
接力赛,分别求满足下列条件的安排方法种数:
(1)甲、乙两人都不跑中间两棒;
(2)甲、乙二人不都跑中间两棒.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd552a5076493896589f1e20787ef4a7.png)
(1)甲、乙两人都不跑中间两棒;
(2)甲、乙二人不都跑中间两棒.
您最近一年使用:0次
【推荐2】从
,
,
等8人中选出5人排成一排.
(1)
必须在内,有多少种排法?
(2)
,
,
三人不全在内,有多少种排法?
(3)
,
,
都在内,且
,
必须相邻,
与
,
都不相邻,都多少种排法?
(4)
不允许站排头和排尾,
不允许站在中间(第三位),有多少种排法?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
您最近一年使用:0次