[理工] 機率 條件機率定義問題
想詢問給定一事件A
f(x|A)=f(x)/P(A)的原因是什麼
為什麼不是P((X=x)且(X屬於A))/P(A)
像是題目中的第二題跟第三題
http://i.imgur.com/aKRqf7s.jpg
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08/13 19:30, , 1F
08/13 19:30, 1F
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08/13 19:30, , 2F
08/13 19:30, 2F
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08/13 19:30, , 3F
08/13 19:30, 3F
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08/13 19:30, , 4F
08/13 19:30, 4F
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08/13 19:31, , 5F
08/13 19:31, 5F
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08/13 19:31, , 6F
08/13 19:31, 6F
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08/13 19:47, , 7F
08/13 19:47, 7F
※ 編輯: david94p (101.8.231.103), 08/13/2017 20:01:12
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08/14 17:37, , 8F
08/14 17:37, 8F
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08/14 17:38, , 9F
08/14 17:38, 9F
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08/14 17:38, , 10F
08/14 17:38, 10F
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08/14 17:39, , 11F
08/14 17:39, 11F
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08/14 17:40, , 12F
08/14 17:40, 12F
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08/14 17:42, , 13F
08/14 17:42, 13F
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08/14 17:43, , 14F
08/14 17:43, 14F