推荐回答(3个)
用0123这四个数字可以组成18个无重复四位数,如下:
1023 1032 1203 1230 1302 1320 2013 2031 2103 2130 2301 2310 3012 3021 3102 3120 3201 3210
3012是第13个.
1023 1032 1203 1230 1302 1320
2013 2031 2103 2130 2301 2310
3012 3021 3102 3120 3201 3210
总共18个没有重复的数字
如果0放前面的也算数字的话
那么还有
0123 0132 0213 0231 0312 0321
这6种
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请参考
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