Cheryl Again!
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 as shown :
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 doesn't know too.
Bernard: At first I don't know when Cheryl's birthday is, but now I know.
Albert: Then I also know when Cheryl's birthday is.
When is Cheryl's birthday ?
source: Science Alert
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