超簡單機率問題! - 拼圖
By Annie
at 2006-06-05T20:20
at 2006-06-05T20:20
Table of Contents
※ 引述《fdis ( )》之銘言:
: 甲、乙兩顆球放暗袋,小明抽一次,抽到甲球的機率是多少?
A箱(2黑) B箱(1黑1紅) C箱(2紅)
任選一箱,抽出一球,結果抽到紅球:
1/2 * 1/3
抽中B箱的機率 = ----------------------------------------------------------
抽中A箱內紅球(0/2)*抽中A箱(1/3) + (1/2)*1/3 + (2/2)*1/3
= 1/3
同理,抽中A箱的機率 = 0
抽中C箱的機率 = 2/3
--
: 甲、乙兩顆球放暗袋,小明抽一次,抽到甲球的機率是多少?
A箱(2黑) B箱(1黑1紅) C箱(2紅)
任選一箱,抽出一球,結果抽到紅球:
1/2 * 1/3
抽中B箱的機率 = ----------------------------------------------------------
抽中A箱內紅球(0/2)*抽中A箱(1/3) + (1/2)*1/3 + (2/2)*1/3
= 1/3
同理,抽中A箱的機率 = 0
抽中C箱的機率 = 2/3
--
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拼圖
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at 2006-06-06T15:39
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