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。 -Apple- Mashable

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Apple Inc. (NASDAQ: AAPL　formerly Apple Computer, Inc.) is an American multinational corporation that designs and sells consumer electronics, computer ...

Apple- Blackboard

www.businessinsider.com/blackboard/apple- CachedApple Inc. is an American multinational corporation that designs and markets consumer electronics, computer software, and personal computers. The companys ...