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原帖由 cws~ 於 2011-7-7 06:57 PM 發表 Do you mean 15 students wear glasses?
學院長老
原帖由 夏娜醬大好 於 2011-7-7 07:10 PM 發表 唔怪得我唔識計啦
原帖由 夏娜醬大好 於 2011-7-7 07:21 PM 發表 條題目有問題題目given果2個人係女仔所以要揾(only 1 wear glasses | both are girls) 7/156係P(only 1 wear glasses and both are girls)
原帖由 夏娜醬大好 於 2011-7-7 08:24 PM 發表 Instead of 8p1*10p2/18p3 + 8p2*10p1/18p3, you may use:[url=tel8)(16)(10)/18](8)(16)(10)/18[/url]P3Consider A ? O ,We have 8 apples and 10 oranges, so it should be 8*something*10For the " ? " , as 2 fruits have been cho ...
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