Lord Foul wrote: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. 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 says: “I don’t know when Cheryl’s birthday is, but I know that Bernard does not know too.”
Bernard says: “At first I didn’t know when Cheryl’s birthday is, but I know now.”
Albert says: “Then I also know when Cheryl’s birthday is.”
So when is Cheryl’s birthday?
Fallout_Monkey wrote:Ah I get it now, it's one of those perfect logician things. Because Albert spoke first(and said what he said) without any input from Bernard that's how Bernard would know it isn't may. Where as my answer of Aug17 would be correct if Bernard had stated first that he couldn't figure it out before they had the same exchange.
Lord Foul wrote:I don't think that would affect the outcome, so Aug 17 is still wrong even after Albert admits he doesn't know. The extra bit of Bernard stating first just replicates the first part of "Bernard says: At first I didn't know". It doesn't add anything new to the chain of logic.
Fallout_Monkey wrote:Is it Aug 17?
because Bernard didn't say anything Albert can eliminate the unique dates of May 19 and June 18.
This leave 2 dates in may, 1 in june, 2 in July and 3 in Aug. Which since Albert says Bernard can't figure it out means June can't be the month. This leaves Bernard with 2 14s, 2 15s, 2 16, and 1 17 so the number had be 17 for Bernard to figure it out
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