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【 以下文字转载自 WaterWorld 讨论区 】
发信人: ms12 (May), 信区: WaterWorld
标 题: when is Cheryl’s birthday? Tricky math problem goes viral
发信站: BBS 未名空间站 (Wed Apr 15 00:00:48 2015, 美东)
Albert and Bernard just became friends with Cheryl, and they want to know
when her birthday is. Cheryl gives them a list of 10 possible dates.
May 15
May 16
May 19
June 17
June 18
July 14
July 16
August 14
August 15
August 17
Cheryl then tells Albert and Bernard separately the month and the day of her
birthday respectively.
Albert: I do not know when Cheryl’s birthday is, but I know that Bernard
does not know too.
Bernard: At first I don’t know when Cheryl’s birthday is, but I know now.
Albert: Then I also know when Cheryl’s birthday is.
So when is Cheryl’s birthday?
发信人: ms12 (May), 信区: WaterWorld
标 题: when is Cheryl’s birthday? Tricky math problem goes viral
发信站: BBS 未名空间站 (Wed Apr 15 00:00:48 2015, 美东)
Albert and Bernard just became friends with Cheryl, and they want to know
when her birthday is. Cheryl gives them a list of 10 possible dates.
May 15
May 16
May 19
June 17
June 18
July 14
July 16
August 14
August 15
August 17
Cheryl then tells Albert and Bernard separately the month and the day of her
birthday respectively.
Albert: I do not know when Cheryl’s birthday is, but I know that Bernard
does not know too.
Bernard: At first I don’t know when Cheryl’s birthday is, but I know now.
Albert: Then I also know when Cheryl’s birthday is.
So when is Cheryl’s birthday?