高一下數學 排列組合 10 相鄰、不相鄰問題 插入的錯誤和改正
Synopsis
本集：「甲到庚七人排一列，6) 甲乙相鄰、丙丁不相鄰、 7) 甲乙不相鄰、丙丁不相鄰-- 插入法的錯誤與修正、 8) 甲不與乙丙鄰的 ...
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