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1~9组成的所有4位数有哪些

更新时间: 2020-09-20 00:00:00     

1、可以组成四位数个数是9×9×9×9=6561个,即1111至9999的所有自然数。

2、若数字要不相同,用排列组合法,可以组成9×8×7×6=3024个,如1234,1235,1236,1237,1238,1239,1243,1253等。

关键词: 组成 所有 位数 哪些

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