It should be clear to a 5-year old that Albert knew Bernard had the day and Bernard knew Albert had the month.

Unless the problem you’re interested in is: How to get out of solving this problem. Also known as: Excuses.

]]>And I found that particular piece of missing confirmation made the problem less mathematically elegant and potentially made the problem a lot more complicated:

“If Albert knew the month but wasn’t aware what particular data Bernard had been given, how could he have made the conclusion that Bernard didn’t know her birthday as well?”

Which would lead to the assumption of an assumption, that Albert would think that based on Cheryl’s enigmatic nature, Cheryl wouldn’t simply give Bernard some bit of data that would be useless in figuring out Cheryl’s birthday. But what if Albert supposes that Bernard might have been given some other type of data, such as: “not May” or “not August”. Alternately, Albert could’ve been a tiny bit of paranoid and think, “I was given the month, but what if Bernard had been given both month AND date?”

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