Dad Jokes

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Three logicians walk into a bar (lemmy.ca)

submitted 1 year ago* (last edited 9 months ago) by [email protected] to c/dadjokes

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The bartender asks "Do all three of you want a beer?"

The first logician says "I don't know".

The second logician says "I don't know."

The third logician says "Yes."

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[–] Bartledan 10 points 1 year ago

First guy knows he wants a beer, but doesn't know if the others do, so says he doesn't know if all three do. However, if he had not wanted a beer, he would have known that not all three wanted one, and therefore would have said no. Which means the second guy then knows that the first guy wants a beer, but does not know if the third does. So he says he doesn't know. That gives the third guy, who also wants a beer, with enough information to say that all three want a beer