Monday, 24 September 2018

排列组合

排列

https://www.iqiyi.com/v_19rra9wm0o.html

两个基本计数原理及应用 
加法原理
乘法原理













一系列视频

https://www.iqiyi.com/v_19rrk6dceo.html#vfrm=3-2-zebra-1&curid=114155900_c2637db58ee8464993ef66ff1b97a4c4



https://www.bilibili.com/video/av21714004?spm_id_from=333.338.__bofqi.19



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