Combinatorics【组合数学基础6】排列组合（三）
Synopsis
组合前面十几讲都是有关计数的，这连续的三讲已经把“排列组合”这一重要的计数工具讲得非常透彻和全面了，无论你是准备什么 ...
![學測數學99_填充C_排列組合_六方格同行、同列的方法數 [5/3/61;53;26;3]](https://i.ytimg.com/vi/_NhKvqUAcLg/hq720.jpg?sqp=-oaymwEcCNAFEJQDSFXyq4qpAw4IARUAAIhCGAFwAcABBg==&rs=AOn4CLDZC1HlnSZzX05q8hzLbmJuTu_CqQ)
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