2015年4月,一道“谢丽尔的生日是哪一天”的初中数学题在Facebook、Twitter等社交媒体上病毒式传播,“难倒了众生”:题干中给出的信息像密码一样难解,并且模棱两可,怎么可能得出精确的答案呢?这道“模棱两可”的“密码”题的题干如下:谢丽尔的生日是下列日期中的一个?5月15日,5月16日,5月19日,6月17日,6月18日,7月14日,7月16日,8月14日,8月15日,8月17日。谢丽尔把月份告诉了阿尔伯特,把日期告诉了伯纳德。 In April 2015, a junior high school math question titled “Cheryl’s Birthday” spread virally on social media such as Facebook and Twitter, “Beneath Beauties”: The message given in the title Could it be possible to come up with a precise answer as hard as a password, and ambiguous? The title of the “ambiguous” “password” is as follows: Cheryl’s birthday is one of the following? 5 May 15, May 16, May 19, June 17, June 18, July 14, July 16, August 14, August 15, August 17. Cheryl told Albert the month, telling Bernard the date.