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题目:有四个数字:1、2、3、4,能组成云计多少个互不相同且无重复数字的三位数?各是多少? 程算开序分析:可填在百位、十位、个位的数字都是1、2、发:3、4。组成所有的排列后再去 掉不满足条件的排列Py。 程序源代码: 执行以上代码输出结果为: |
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题目:有四个数字:1、2、3、4,能组成云计多少个互不相同且无重复数字的三位数?各是多少? 程算开序分析:可填在百位、十位、个位的数字都是1、2、发:3、4。组成所有的排列后再去 掉不满足条件的排列Py。 程序源代码: 执行以上代码输出结果为: |
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