[lit-ideas] Re: Try a Logic Problem
- From: wokshevs@xxxxxx
- To: lit-ideas@xxxxxxxxxxxxx, Paul Stone <pas@xxxxxxxx>
- Date: Tue, 27 Jun 2006 18:01:36 -0230
OK, let me see, according to my e-mail log, Paul S. posts but answer is
incorrect, then Phil posts with the correct answer, then RP tells us about
Copi's political incorrectness (agreed, Hurley's *Concise intro to logic* is
much better all round), then Lloyd sends a piece of cake to Phil, then Paul
tries again but raises an objection from Phil, then Paul replies to Phil, Phil
replies to Paul, then Paul replies to Phil, then Phil responds very astutely to
Paul (although I no longer remember why that response was astute), then Paul
offers a "verbose solution" which looked right to me at the time, then Phil
replied to Paul again for some reason and then Eric Yost expressed "moral
outrage" which I thought was quite beside the point, but whatever, and then
Lloyd M. posted a solution which my records say is correct.
Thus, according to my records it appears that Phil Enns was the first to
correctly answer the 2-pronged problem. Congratulations, Phil! I'm not sure
what the prize will be but I won't be surprised if we receive a plethora of
suggestions regarding an appropriate reward for your efforts.
I have alot more puzzles and problems in my magic box, should anybody still be
bored and lonely and tired of listening to old Roy Orbison tunes.
Problematically yours,
Walter O.
P.S. Here's an easy one: Why should you not criticize people until you've walked
a mile in their shoes? (You don't need to be Catholic to figure out the
answer.) I used to make money on this stuff at Camping Bagetelle in Avignon,
just across from the bridge that doesn't go anywhere. Don't know if it's still
there, Teemu. Enjoy.
Quoting Paul Stone <pas@xxxxxxxx>:
>
> > > > Here, as promised, for all the bored and lonely souls, is a problem I
> > > > offer my students. I often get e-mail
> > > > requests years after the course from students who have forgotten the
> > > > solution and desperately need it for their Saturday evening escapades
> and
> > > > reflections. I am informed that some have made quick money in pubs
> > with it
> > > > and/or gotten lucky in some other manner. However, I ask for no
> > > > commission.
> > > >
> > > >
> > > The guard now asks prisoner #1 "Can you tell me the colour of the hat
> > > > you're wearing. The prisoner responds "No, I cannot."
> > > >
> > > > The guard then asks prisoner #2 the same question and he receives the
> > same
> > > > answer.
> > > >
> > > > Finally, the guard asks prisoner #3 and prisoner #3 replies that he
> does
> > > > indeed know the colour of the hat he's wearing.
> > > >
> > > > The problem, should you decide to accept it, is: what is the colour
> > of the
> > > > hat #3 is wearing, and more importantly, in logic as in love, how did
> he
> > > > figure it out?
> > > >
> > > > I forgot to mention one small detail here. Prisoner #3 is completely
> > > > blind. This is a problem in strict logic, nothing up my sleeves,
> Rocky
>
>
> The blind guy has a white hat on.
>
> 1) Prisoner 1 can see both 2 and 3's hats. He doesn't know what his hat is,
> therefore, their hats have to be white and red or two whites.
>
> 2) Prisoner 2 can see both 1 and 3's hats. He doesn't know what his hat is,
> therefore 1 and 3 must be wearing either W/W or R/W.
>
> 3) Since neither prisoner 1 or 2 knows which colour hat they have on, they
> must BOTH be wearing red ones because, if 3 had a red hat on, prisoner #2
> would KNOW that he has a white one on -- since both 2 and 3 can't both have
> Reds or number 1 would know that he has a white one on.
>
> paul
>
> ##########
> Paul Stone
> pas@xxxxxxxx
> Kingsville, ON, Canada
>
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