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#899769 - 07/08/13 10:57 AM Coffee?
CanukDenis Offline
Graduate Boomer

Registered: 11/26/00
Posts: 17701
Loc: 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.
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A true friend is a friend in spite of, not because of.

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#899789 - 07/08/13 12:29 PM Re: Coffee? [Re: CanukDenis]
nell_nerhegeb Offline
Shy Boomer

Registered: 01/11/13
Posts: 20
.. I have a feeling I missed something laugh

The 4th doesn't want coffee.

The first three want coffee.

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#899793 - 07/08/13 01:02 PM Re: Coffee? [Re: CanukDenis]
BobH Offline
Addicted Boomer

Registered: 10/14/11
Posts: 3440
Loc: 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.
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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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#899794 - 07/08/13 01:12 PM Re: Coffee? [Re: CanukDenis]
CanukDenis Offline
Graduate Boomer

Registered: 11/26/00
Posts: 17701
Loc: Ottawa Ontario Canada
Ya'll got it!
The 4th logician could instead have said:
"bring 3 coffees"
_________________________
A true friend is a friend in spite of, not because of.

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#899795 - 07/08/13 01:23 PM Re: Coffee? [Re: CanukDenis]
Redz Offline
Adept Boomer

Registered: 08/12/00
Posts: 13944
Loc: Doylestown, Pennsylvania
birthday, BobH. Hope you have a great day grin

Joan wave

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#899799 - 07/08/13 01:35 PM Re: Coffee? [Re: Redz]
Sherlock Offline
BAAG Specialist

Registered: 02/27/01
Posts: 8687
Loc: Minnesota, USA
Happy Birthday, Bob! birthday
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If every 8 year old in the world is taught meditation, we will eliminate violence from the world within one generation. - Dalai Lama

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#899802 - 07/08/13 01:43 PM Re: Coffee? [Re: CanukDenis]
BobH Offline
Addicted Boomer

Registered: 10/14/11
Posts: 3440
Loc: 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.

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#899803 - 07/08/13 01:57 PM Re: Coffee? [Re: CanukDenis]
nell_nerhegeb Offline
Shy Boomer

Registered: 01/11/13
Posts: 20
Oh good, that was also my line of thought.

A Happy Birthday from me as well smile

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#899894 - 07/08/13 08:59 PM Re: Coffee? [Re: CanukDenis]
soot Offline
Puzzled Moderator
Sonic Boomer

Registered: 04/16/05
Posts: 26581
Loc: Usually up an Alabama Tree
Welcome to the Garden Nell wave
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To learn, read...To know, write...To master, teach...To live, play games & listen to whale music

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#900240 - 07/10/13 11:26 AM Re: Coffee? [Re: CanukDenis]
nell_nerhegeb Offline
Shy Boomer

Registered: 01/11/13
Posts: 20
Thank you soot smile I'm sure I'll come here again

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