高一下數學 排列組合 09 相鄰、不相鄰問題 排容的錯誤與改正
Synopsis
本集：「甲到庚七人排一列-- 1)甲乙相鄰； 2)甲乙不相鄰與分拆討論； 3)甲乙丙相鄰； 4) 甲乙相鄰且丙丁相鄰； 5) 甲乙丙兩兩不相 ...
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