作者linkinwu (小鬼)
看板GRE_Verbal
標題[計量] 一題五月份 印度計量JJ的問題 @@
時間Tue May 27 17:09:50 2008
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 = ="
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