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Coffee?
#899769
07/08/13 10:57 AM
07/08/13 10:57 AM
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Joined: Nov 2000
Posts: 18,719
Ottawa Ontario Canada
CanukDenis
OP
Graduate Boomer
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OP
Graduate Boomer
Joined: Nov 2000
Posts: 18,719
Ottawa Ontario Canada
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Four logicians in a restaurant have just finished lunch
when the waitress comes by and asks "Do all of you want coffee?"
The first logician answers "I don't know".
The 2nd and 3rd logicians also answer "I don't know".
The 4th logician answers "No"
Assuming all 4 responded with correct answers ,
how many want coffee and which ones , if any , want coffee.
I'm a man of few words, BUT I use 'em often!!
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Re: Coffee?
[Re: CanukDenis]
#899789
07/08/13 12:29 PM
07/08/13 12:29 PM
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Joined: Jan 2013
Posts: 20
nell_nerhegeb
Shy Boomer
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Shy Boomer
Joined: Jan 2013
Posts: 20
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.. I have a feeling I missed something  The 4th doesn't want coffee. The first three want coffee.
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Re: Coffee?
[Re: CanukDenis]
#899793
07/08/13 01:02 PM
07/08/13 01:02 PM
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Joined: Oct 2011
Posts: 3,440
47.79N, 122.24W
BobH
Addicted Boomer
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Addicted Boomer
Joined: Oct 2011
Posts: 3,440
47.79N, 122.24W
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Nell, by my logic, you got it right. They take the waitress literally when she asks if they ALL want coffee. If the first one didn't want coffee, he would know that they then couldn't ALL want coffee so he would say no. It is only if he wanted coffee that he would have to answer, "I don't know" because he wouldn't yet know if every one of them wanted coffee.
The same goes for the second and third logicians until finally the fourth can say with certainty that they don't ALL want coffee because he doesn't.
Bob
As I've grown older, I've found that my memory is not as good as I used to think it was.
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, BobH. Hope you have a great day 
