[計量] 請教一題機率問題

看板GRE作者 (GB)時間16年前 (2009/05/31 13:04), 編輯推噓3(3推 0噓 5→)
留言8則, 4人參與, 最新討論串1/1
A certain five-member committee must be asse mbled from a pool of five women-A, B, C, D, and E, and three men-X, Y, and Z, what is the probability that the committee will include B, C, E, Y, and Z? (A) 1/30 (B) 1/25 (C) 2/35 (D) 1/15 (E) 3/32 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.175.223.99
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05/31 13:19, , 1F
1/C(8,5) = 1/56???
05/31 13:19, 1F
推
05/31 13:24, , 2F
A ???
05/31 13:24, 2F
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05/31 13:42, , 3F
答案是(C) 但是算不出來，不知道是不是題目有錯= =
05/31 13:42, 3F
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05/31 13:43, , 4F
打錯 答案是(A) 可是怎麼算????
05/31 13:43, 4F
推
05/31 13:45, , 5F
1/(C(5,3)*C(3,2))=1/30
05/31 13:45, 5F
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05/31 13:53, , 6F
C(5,3)*C(3,2)=(5*4*3)*(3*2) 不是30捏= =????
05/31 13:53, 6F
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05/31 13:58, , 7F
我錯了 我沒除排列數= ="
05/31 13:58, 7F
推
05/31 22:22, , 8F
題目沒寫清楚吧 沒規定女生一定要三人 男生要兩人吧
05/31 22:22, 8F
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