reason :

來源: commentate 於 2010-06-21 13:14:17 [] [舊帖] [給我悄悄話] 閱讀數 : (289 bytes)

why 70 :

Total number of wrong answers from all people is 90. For number of people having 3 or more correct answers to be minimal, the number of people making 3 or more mistakes should be maximal. So, these 90 mistakes should be made by 30 people, each of them makes 3 mistakes.

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