[計量] If a bowl contains seven marbles ...

看板GRE (GRE入學考試)作者 (惡性循環........)時間17年前 (2008/10/13 23:34), 編輯推噓0(000)
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題目是 If a bowl contains seven marbles, three red and four green, four marbles are drawn from the bowl at random without replacement. What is the propability that contains two red marbles and two green ones? 答案是18/35 不知要怎麼解,麻煩各位幫我解答一下,謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.168.5.36
文章代碼(AID): #18ysfuHk (GRE)
文章代碼(AID): #18ysfuHk (GRE)