A maths question for Singapore schoolkids

Re:A maths question for Singapore schoolkids by logfromblammo on Monday April 13, 2015 @04:45PM (#9370367)

Another question, with the same date set:

  Albert: I don't know, but Bernard might.
  Bernard: Then your birthday is in May!
  Albert: Ha ha!  I was lying about what I knew.
  Bernard: So was I!
  Cheryl: Then you both know my birthday now.

(May 15, 16, 19, June 17, 18, July 14, 16, August 14, 15, 17)

[ Parent | on HN ]

Re:A maths question for Singapore schoolkids by jahooma on Monday April 13, 2015 @07:02PM (#9371085)

August 17, assuming Bernard would have said something different if he knew Albert's first comment was impossible.

[ Parent | on HN ]

Re:A maths question for Singapore schoolkids by itaibn on Monday April 13, 2015 @07:58PM (#9371289)

If Bernard knew that Albert's first comment was impossible, then by the principle of explosion his first statement is correct according to his premises. Therefore his seond statement saying that his first statement is a lie would be incorrect.

[ Parent | on HN ]