【每天一道编程系列-2018.1.29】(Ans)

【题目描述】 There are four numbers of 1, 2, 3, and 4. How many three digits numbers can they make up that are different from each other without repeating numbers? How much are they? 【题目翻译】 有1、2、3、4四个数字,它们能
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