文件名称:c
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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？
-There 1,2,3,4 numbers, how many can be formed from each other and without duplication of the three-digit numbers? How many are?
-There 1,2,3,4 numbers, how many can be formed from each other and without duplication of the three-digit numbers? How many are?
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