It is an interesting problem and might be asked in the interviews.

Cheryl birthday puzzle.

Wiki cheryl s birthday is the unofficial name given to a mathematics brain teaser that was asked in the singapore and asian schools math olympiad and was posted online on 10 april 2015 by singapore tv presenter. Cheryl s birthday problem has been extrmeley viral on facebook and whatsapp since 2015 till date. I didn t know at first but now i do know. I don t know the birthday but i know bernard doesn t know either. Albert has therefore deduced that the possible dates are july 16 aug 15 and aug 17. Now i also know cheryl s birthday.

When is cheryl s birthday. Then i also know when cheryl s birthday is. Written by dr joseph yeo boon woi of singapore s national institute of education the objective is to determine the birthday of a girl named cheryl using a handful of clues given to her friends albert and bernard. It is based on logical deduction. From wikipedia the free encyclopedia cheryl s birthday is a logic puzzle specifically a knowledge puzzle. Albert and bernard have just become friends with cheryl an.