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Posted

http://static01.nyt.com/images/2015/04/15/science/15mathanswer/15mathanswer-popup-v3.png

 

Now let’s examine what Albert and Bernard say. Albert goes first:

I don’t know when your birthday is, but I know Bernard doesn’t know, either.

The first half of the sentence is obvious — Albert only knows the month, but not the day — but the second half is the first critical clue.

The initial reaction is, how could Bernard know? Cheryl only whispered the day, so how could he have more information than Albert? But if Cheryl had whispered “19,” then Bernard would indeed know the exact date — May 19 — because there is only one date with 19 in it. Similarly, if Cheryl had told Bernard, “18,” then Bernard would know Cheryl’s birthday was June 18.

Thus, for this statement by Albert to be true means that Cheryl did not say to Albert, “May” or “June.” (Again, for logic puzzles, the possibility that Albert is lying or confused is off the table.) Then Bernard replies:

I didn’t know originally, but now I do.

Posted

so this came up on my feed from a friend of a friend....bliksem is all i can say

 

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The beginning of the end of all his scoring will be somewhere in October.....  :D

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