1,2,3,4,5 五个数字的所有组合
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1,2,3,4,5五个数字全排列,要求任意两位不可有重复的数字的组合有多少种?~
12345,12354,12435,12453,12534,12543;
13245,13254,13425,13452,13524,13542;
14235,14253,14325,14352,14523,14532;
15234,15243,15324,15342,15423,15432;
21345,21354,21435,21453,21534,21543;
23145,23154,23415,23451,23514,23541;
24135,24153,24315,24351,24513,24531;
25134,25143,25314,25341,25413,25431;
31245,31254,31425,31452,31524,31542;
32145,32154,32415,32451,32514,32541;
34125,34152,34215,34251,34512,34521;
35124,35142,35214,35241,35412,35421;
41235,41253,41325,41352,41523,41532;
42135,42153,42315,42351,42513,42531;
43125,43152,43215,43251,43512,43521;
45123,45132,45213,45231,45312,45321;
51234,51243,51324,51342,51423,51432;
52134,52143,52314,52341,52413,52431;
53124,53142,53214,53241,53412,53421;
54123,54132,54213,54231,54312,54321;
A5选1 A5选2 A5选3 A5选4 A5选5 总共加起来的个数就是答案
数字不可重复的5位数 120种
数字不可重复的1~5位数 325种
数字可重复的5位数 3125种
数字可重复的1~5位数 3905种
有120种了,自己写。
问题不明确。选几个?都用吗?可以重复用吗?
1,2,3,4,5 五个数字的所有组合视频
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2
C =(5*4*3*2*1)/(2*1)=60种
5
不知道你需要的是什么语言! 用java给你写了个范例..public static void main(String[] args) {int[] a = {1,2,3,4,5};for (int i = 0; i < a.length; i++) {for (int j = 0; j < a.length; j++) {System.out.print(a[i]+""+a[j]+";");}}}输出结果为:11;12;13;14;15;21;22;23;24;25;31;32;33;34;35;41;42;43;44;45;51;52;53;54;55;
12345,12354,12435,12453,12534,12543;
13245,13254,13425,13452,13524,13542;
14235,14253,14325,14352,14523,14532;
15234,15243,15324,15342,15423,15432;
21345,21354,21435,21453,21534,21543;
23145,23154,23415,23451,23514,23541;
24135,24153,24315,24351,24513,24531;
25134,25143,25314,25341,25413,25431;
31245,31254,31425,31452,31524,31542;
32145,32154,32415,32451,32514,32541;
34125,34152,34215,34251,34512,34521;
35124,35142,35214,35241,35412,35421;
41235,41253,41325,41352,41523,41532;
42135,42153,42315,42351,42513,42531;
43125,43152,43215,43251,43512,43521;
45123,45132,45213,45231,45312,45321;
51234,51243,51324,51342,51423,51432;
52134,52143,52314,52341,52413,52431;
53124,53142,53214,53241,53412,53421;
54123,54132,54213,54231,54312,54321;
A5选1 A5选2 A5选3 A5选4 A5选5 总共加起来的个数就是答案
数字不可重复的5位数 120种
数字不可重复的1~5位数 325种
数字可重复的5位数 3125种
数字可重复的1~5位数 3905种
有120种了,自己写。
问题不明确。选几个?都用吗?可以重复用吗?
1,2,3,4,5 五个数字的所有组合视频
相关评论: