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Coffee? #899769
07/08/13 10:57 AM
07/08/13 10:57 AM
Joined: Nov 2000
Posts: 18,719
Ottawa Ontario Canada
CanukDenis Offline OP
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CanukDenis  Offline OP
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Joined: Nov 2000
Posts: 18,719
Ottawa Ontario Canada
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!!
Re: Coffee? [Re: CanukDenis] #899789
07/08/13 12:29 PM
07/08/13 12:29 PM
Joined: Jan 2013
Posts: 20
N
nell_nerhegeb Offline
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nell_nerhegeb  Offline
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N

Joined: Jan 2013
Posts: 20
.. I have a feeling I missed something laugh

The 4th doesn't want coffee.

The first three want coffee.

Re: Coffee? [Re: CanukDenis] #899793
07/08/13 01:02 PM
07/08/13 01:02 PM
Joined: Oct 2011
Posts: 3,440
47.79N, 122.24W
BobH Offline
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BobH  Offline
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Posts: 3,440
47.79N, 122.24W
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.
Re: Coffee? [Re: CanukDenis] #899794
07/08/13 01:12 PM
07/08/13 01:12 PM
Joined: Nov 2000
Posts: 18,719
Ottawa Ontario Canada
CanukDenis Offline OP
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CanukDenis  Offline OP
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Joined: Nov 2000
Posts: 18,719
Ottawa Ontario Canada
Ya'll got it!
The 4th logician could instead have said:
"bring 3 coffees"


I'm a man of few words, BUT I use 'em often!!
Re: Coffee? [Re: CanukDenis] #899795
07/08/13 01:23 PM
07/08/13 01:23 PM
Joined: Aug 2000
Posts: 16,715
Doylestown, Pennsylvania
Redz Offline
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Redz  Offline
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Doylestown, Pennsylvania
birthday, BobH. Hope you have a great day grin

Joan wave

Re: Coffee? [Re: Redz] #899799
07/08/13 01:35 PM
07/08/13 01:35 PM
Joined: Feb 2001
Posts: 10,699
Minnesota, USA
Sherlock Offline
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Sherlock  Offline
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Minnesota, USA
Happy Birthday, Bob! birthday


The best math you can learn is how to calculate the future cost of current decisions.
Re: Coffee? [Re: CanukDenis] #899802
07/08/13 01:43 PM
07/08/13 01:43 PM
Joined: Oct 2011
Posts: 3,440
47.79N, 122.24W
BobH Offline
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BobH  Offline
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47.79N, 122.24W
Thanks for the birthday wishes! penguin


Bob
As I've grown older, I've found that my memory is not as good as I used to think it was.
Re: Coffee? [Re: CanukDenis] #899803
07/08/13 01:57 PM
07/08/13 01:57 PM
Joined: Jan 2013
Posts: 20
N
nell_nerhegeb Offline
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nell_nerhegeb  Offline
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Oh good, that was also my line of thought.

A Happy Birthday from me as well smile

Re: Coffee? [Re: CanukDenis] #899894
07/08/13 08:59 PM
07/08/13 08:59 PM
Joined: Apr 2005
Posts: 37,661
Alabama
soot Offline
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soot  Offline
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Alabama
Welcome to the Garden Nell wave


Dan
...
To learn, read...To know, write...To master, teach...To live, play games & listen to whale music Stay Smart & Stay Safe
Re: Coffee? [Re: CanukDenis] #900240
07/10/13 11:26 AM
07/10/13 11:26 AM
Joined: Jan 2013
Posts: 20
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nell_nerhegeb Offline
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nell_nerhegeb  Offline
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Joined: Jan 2013
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Thank you soot smile I'm sure I'll come here again

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