[計量] 一題五月份 印度計量JJ的問題 @@

看板GRE (GRE入學考試)作者 (小鬼)時間18年前 (2008/05/27 17:09), 編輯推噓0(000)
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6. John wrote a phone number on a note that was later lost. John can remember that the number had 7 digits, the digit "1" appeared in the last three places and "0" did not appear at all. What is the probability that the phone number contains at least two prime digits? a) 15/16 b) 11/16 c) 11/12 d) 1/2 e) 5/8 這題題目的理解,不是很了解。 題目意思是說,1出現在末三碼每一碼還是只出現在三 碼其中之一。題目有提到說0沒出現,那1可以再出現在前面嗎?! 有無高手可以解釋一下也解答一下!! @@ 想了好久 = =" -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 61.57.96.147
文章代碼(AID): #18Ey_W2F (GRE)
文章代碼(AID): #18Ey_W2F (GRE)