1,2,3,4 四名同学排成一排,有多少种排法?

分类: 作业答案 • 2022-01-15 23:24:03

问题描述：

答

1234,1324,1342,1432,1423,2143,2413,2431,2314,2341,3124,3214,3241,3412,3421,4123,4213,4231,4213,4231,4312,4312.