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Old 19.01.2011, 18:27
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a riddle because I'm bored.

I'm seriously bored right now.



So I thought perhaps a riddle thread would be fun.



Shown above are four men buried up to their necks in the ground. They cannot move, so they can only look forward. Between A and B is a brick wall which cannot be seen through.
They all know that between them they are wearing four hats--two black and two white--but they do not know what color they are wearing. Each of them know where the other three men are buried.
In order to avoid being shot, one of them must call out to the executioner the color of their hat. If they get it wrong, everyone will be shot. They are not allowed to talk to each other and have 10 minutes to fathom it out.
After one minute, one of them calls out.
Question: Which one of them calls out? Why is he 100% certain of the color of his hat?
This is not a trick question. There are no outside influences nor other ways of communicating. They cannot move and are buried in a straight line; A & B can only see their respective sides of the wall, C can see B, and D can see B & C.


I've alreaady solved it but I want other people to not be bored.

from http://www.mycoted.com
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Old 19.01.2011, 18:36
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Re: a riddle because I'm bored.

C

And he's hoping that D isn't catatonic or dumber than dirt .
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Old 19.01.2011, 18:40
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Re: a riddle because I'm bored.

I'd pick "C". He yells Black.

"A" has no point of reference and can't answer.

"B&D" can only see a White and black hat each. It's only a 50% probability.

"C" can only see two white hats.... he knows that there are 4 hats (2 white, and two black), therefore without knowing what the other guy has, both hats can only be black.


Do I get shot?
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Old 19.01.2011, 18:42
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C should assume he would have a black hat, otherwise d would know that he had a bla k hat, which b would assume the riddler wouldnt want. Or something

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Old 19.01.2011, 18:43
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Re: a riddle because I'm bored.

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I'd pick "C". He yells Black.

"A" has no point of reference and can't answer.

"B&D" can only see a White and black hat each. It's only a 50% probability.

"C" can only see two white hats.... he knows that there are 4 hats (2 white, and two black), therefore without knowing what the other guy has, both hats can only be black.


Do I get shot?

peek...
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Old 19.01.2011, 18:44
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Re: a riddle because I'm bored.

A few quick riddles:

http://www.rinkworks.com/brainfood/p/riddles1.shtml
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Old 19.01.2011, 18:48
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Re: a riddle because I'm bored.

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I'd pick "C". He yells Black.

"A" has no point of reference and can't answer.

"B&D" can only see a White and black hat each. It's only a 50% probability.

"C" can only see two white hats.... he knows that there are 4 hats (2 white, and two black), therefore without knowing what the other guy has, both hats can only be black.


Do I get shot?

Ok, I'm not good at these, but how does C see two white hats?
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Old 19.01.2011, 18:48
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Re: a riddle because I'm bored.

Yep, it's got to be C who calls out.

He knows that D can see both him and B, and knows that if he and B have the same colour then D would be calling out pretty quickla as that's obvious. After leaving D enough time to work that out, he know that D must be seeing two different colours and so C knows that his colour is different from B's.
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Old 19.01.2011, 18:50
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Re: a riddle because I'm bored.

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Yep, it's got to be C who calls out.

He knows that D can see both him and B, and knows that if he and B have the same colour then D would be calling out pretty quickla as that's obvious. After leaving D enough time to work that out, he know that D must be seeing two different colours and so C knows that his colour is different from B's.

Excellent! that makes sense!
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Old 19.01.2011, 18:51
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Re: a riddle because I'm bored.

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Ok, I'm not good at these, but how does C see two white hats?
He doesn't. He sees only B.
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Old 19.01.2011, 18:52
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Re: a riddle because I'm bored.

Can we do the spoiler thing:

hello..



let's not ruin it for everybody else
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Old 19.01.2011, 18:53
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Re: a riddle because I'm bored.

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Can we do the spoiler thing:

hello..



let's not ruin it for everybody else
How do you do that?
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  #13  
Old 19.01.2011, 18:54
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Re: a riddle because I'm bored.

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How do you do that?

[ spoiler= hello...] "put answer here [/spoiler] <-- take the space after the first bracket and you are set.
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  #14  
Old 19.01.2011, 18:54
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Re: a riddle because I'm bored.

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He doesn't. He sees only B.

Agreed, making a riddle because I'm bored.
a non-defendable answer, sorry Billhardie
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Old 19.01.2011, 18:55
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Re: a riddle because I'm bored.

For anyone who's bored - try this. Not a riddle, but not quickly solved, either, and frustratingly compulsive.

http://members.iinet.net.au/~pontipak/redsquare.html
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Old 19.01.2011, 19:04
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Re: a riddle because I'm bored.

since this is Switzerland:

Five pieces of coal, a carrot and a scarf are lying on the lawn. Nobody put them on the lawn but there is a perfectly logical reason why they should be there. What is it?

Answer
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  #17  
Old 19.01.2011, 19:06
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Re: a riddle because I'm bored.

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since this is Switzerland:

Five pieces of coal, a carrot and a scarf are lying on the lawn. Nobody put them on the lawn but there is a perfectly logical reason why they should be there. What is it?

Answer

something along the lines of vegan hipster who was bad at christmas?
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  #18  
Old 19.01.2011, 19:06
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Re: a riddle because I'm bored.

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What is it?
...a Mexican roasted salad bar in the making?
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Old 19.01.2011, 19:12
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Re: a riddle because I'm bored.

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... Shown above are four men buried up to their necks in the ground...
It has to be a Mexican riddle.

A calls out first, B next (opposite colour of A) then D makes the adjustment and C calls out whatever is left (as they know between them 2 each have same coloured hats)

Sorry, didnt realise they have to get it right too, executioner cannot be fooled
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  #20  
Old 19.01.2011, 19:12
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Re: a riddle because I'm bored.

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since this is Switzerland:

Five pieces of coal, a carrot and a scarf are lying on the lawn. Nobody put them on the lawn but there is a perfectly logical reason why they should be there. What is it?

Answer

Melted snowman
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