【每天一道編程系列-2018.1.29】(Ans)

【題目描述】 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? 【題目翻譯】 有1、2、3、4四個數字,它們能
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