[計量] 問一題 感覺有點難

看板GRE作者 (河馬)時間13年前 (2011/03/10 21:35), 編輯推噓6(6010)
留言16則, 7人參與, 最新討論串1/2 (看更多)
題目 Two cubical dice each have removable numbers 1 through 6. The tweleve numbers on the two dice are removed, put into a bag, then drawn one at a time and randomly reattached to the faces of the cubes, one number to each face. The dice are then rolled and the numbers on the two top faces are added. What is the probability that the sum is 7? 排列組合好難喔~ 可是機考會出那麼難的嗎 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 122.120.130.13

03/10 21:38, , 1F
會 因為前面都廢話...
03/10 21:38, 1F

03/11 12:06, , 2F
請問這題有人會嗎 能否解答一下
03/11 12:06, 2F

03/11 13:47, , 3F
就是問你兩顆骰子和為7的機率是多少
03/11 13:47, 3F

03/11 13:48, , 4F
16 25 34 43 52 61 => 6種組合/總共36種組合 = 1/6
03/11 13:48, 4F

03/11 13:49, , 5F
前面懶得看...因為不會出到什麼變形的難題...
03/11 13:49, 5F

03/11 21:48, , 6F
可是前面敘述看起來不像是普通骰子耶~~他把骰子上的
03/11 21:48, 6F

03/11 21:49, , 7F
數字都拆下來,再隨機裝上去...是這樣的意思嗎?
03/11 21:49, 7F

03/11 22:08, , 8F
應該沒有三樓說的簡單 有可能兩個同樣的數字裝在
03/11 22:08, 8F

03/11 22:08, , 9F
同一個骰子上吧 我看題目的意思覺得是這樣
03/11 22:08, 9F

03/11 23:00, , 10F
可是答案是2/11耶
03/11 23:00, 10F

03/11 23:01, , 11F
對阿 題目是sluggard講的那樣
03/11 23:01, 11F

03/12 02:26, , 12F
答案是2/11 好像蠻多人都算1/6
03/12 02:26, 12F

03/16 17:15, , 13F
GRE機考不會出那麼難的題目,此題是2009年10th
03/16 17:15, 13F

03/16 17:16, , 14F
Annual American Mathematics Contest的難題,並非
03/16 17:16, 14F

03/16 17:16, , 15F
ETS所出之GRE考古題。答案 = 2/11。
03/16 17:16, 15F

03/16 17:17, , 16F
(以上內容由美加 江璞老師提供)
03/16 17:17, 16F
文章代碼(AID): #1DUDEeQm (GRE)
文章代碼(AID): #1DUDEeQm (GRE)