文件名称:2
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有1、2、3、4个数字，能组成多少个互不相同且无重复数字的三位数？都是多少？
-1, 2, 3, 4 numbers, how many can be composed of different from each other and no redundant digital three figures? All is a number?
-1, 2, 3, 4 numbers, how many can be composed of different from each other and no redundant digital three figures? All is a number?
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2.c
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