93年初考19題 - 考試
By Lucy
at 2013-12-29T20:15
at 2013-12-29T20:15
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
一盒中有5白球3黑球2紅球,現在放回抽樣抽四球,出現2白1黑11紅的機率是多少
答案0.09
我的想法是用三項去算
4!
______________________ *0.5^2*0.3*0.2=0.18
2!1!1!
但答案多乘了一個1/2=>0.18*1/2=0.09
請問是為什麼?是哪裡我欠思慮?
--
一盒中有5白球3黑球2紅球,現在放回抽樣抽四球,出現2白1黑11紅的機率是多少
答案0.09
我的想法是用三項去算
4!
______________________ *0.5^2*0.3*0.2=0.18
2!1!1!
但答案多乘了一個1/2=>0.18*1/2=0.09
請問是為什麼?是哪裡我欠思慮?
--
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考試
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