集合
的五元子集
中,任何两元素之差不为1.这样子集
的个数为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/058f8f3ed9370a5e6c0130094eca7487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a2cb61527092a05cbcda7e8ac54e377.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
2018高三·全国·竞赛 查看更多[1]
更新时间:2018-12-20 10:09:01
|
【知识点】 映射法
相似题推荐
单选题
|
适中
(0.65)
【推荐1】设
,
.如果映射
,使得
,则这种映射的个数是.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8b41e2f3ea8bfcf2c04bf8708500e02.png)
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A.16 | B.17 | C.19 | D.24 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】设
、
、
、
是1、2、3、4分任一个排列,
是
到
的一一映射,且满足
,记数表
.若数表
、
的对应位置上至少有一个不同,就说
、
是两张不同的数表.则满足条件的不同数表的张数为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
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A.144 | B.180 | C.216 | D.240 |
您最近一年使用:0次