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？各是多少算开？
程序分析：可填在百位、十位、个位的数字都是1发：、2、3、4。组成所有的排列后再去 掉不满足条件的Py排列。
程序源代码：
执行以上代码输出结果为：
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