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题目: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.程序分析:可填在百位、十位、个位的数字都是1、2、3、4。组成所有的排列后再去
掉不满足条件的排列。-Title: There 1,2,3,4 digits, to form different from each other and how many three-digit numbers without repetition? Is how much? 1 program analysis: can fill in one hundred, ten, a bit of the numbers are 1,2,3,4. Composed of all the permutations and then remove the arrangement does not meet the conditions.
1.程序分析:可填在百位、十位、个位的数字都是1、2、3、4。组成所有的排列后再去
掉不满足条件的排列。-Title: There 1,2,3,4 digits, to form different from each other and how many three-digit numbers without repetition? Is how much? 1 program analysis: can fill in one hundred, ten, a bit of the numbers are 1,2,3,4. Composed of all the permutations and then remove the arrangement does not meet the conditions.
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