可以把上麵“Open B”改成“Not Car@B”，條件概率定義計算更簡單

來源: slow_quick 於 2024-02-22 22:33:15 [] [博客] [舊帖] [給我悄悄話] 閱讀數 : (398 bytes)

P(Car@A | Not Car@B)

= P(Car@A & Not Car@B) / P(Not Car@B)

= P(Car@A) / P(Not Car@B) = (1/3) / (2/3) = 1/2

similarly

P(Car@C | Not Car@B)

= P(Car@C & Not Car@B) / P(Not Car@B)

= P(Car@C) / P(Not Car@B) = (1/3) / (2/3) = 1/2

當然了，

P(Car@A | Car@B) = P(Car@C | Car@B) = 0

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