----- Nội dung ảnh ----- 24. Albert and Bernard just become 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 don’t 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. Then I also know when Cheryl’s birthday is. Albert: Then so when is Cheryl’s birthday?
