文件名称:include111
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有1、2、3、4个数字，能组成哪些互不相同且无重复数字的三位数？都是多少？
-1, 2, 3, 4 digits, which different from each other and no duplicate numbers three digits can be formed? Are how many?
-1, 2, 3, 4 digits, which different from each other and no duplicate numbers three digits can be formed? Are how many?
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