[中學] 排列組合
甲乙丙...共12人 住在ABC房 每間4人
請問甲乙不住同一房的機率為何?
( C(10,3)*C(7,3)*C(4,4)/2! ) * 2!
這題解答是寫 -------------------------------------
( C(12,4)*C(8,4)*C(4,4)/3! ) * 3!
我的疑問是
想請問分子為什麼不必多乘 C(3,2) (ABC三間房 取兩間給甲和乙住)
因為 A B C
甲 乙
甲 乙
這兩種情況是不同的阿
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