习题001：数字的排列组合
Synopsis
题目：有四个数字：1、2、3、4，能组成多少个互不相同且无重复数字的三位数？各是多少？
學校老師沒有教的，排列組合算式中，分母的秘密](https://i.ytimg.com/vi/JeB-8kf-gyE/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLCIy8I9J510Q7WzNLI9Z6d_HmPVgQ)
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