The Riddles Thread

I like how Tim can reason out that entire thing, but not understand what J's actual question was :lol:

I like El Mac's question, because it gives them all an incentive to say their own colour if known. Other riddles are all like "you have to do this and you have to do that" and so on: they just lay out the rules and you have to accept them, no matter how little sense they make. But in El Mac's question, you don't need to know that they won't lie, or will for certain always say their own colour ASAP. It's also such a simple puzzle conceptually that you don't have to wonder if they are too stupid to work it all out themselves. It's very satisfying for someone as pedantic as me...
 
I like how Tim can reason out that entire thing, but not understand what J's actual question was :lol:

I like El Mac's question, because it gives them all an incentive to say their own colour if known. Other riddles are all like "you have to do this and you have to do that" and so on: they just lay out the rules and you have to accept them, no matter how little sense they make. But in El Mac's question, you don't need to know that they won't lie, or will for certain always say their own colour ASAP. It's also such a simple puzzle conceptually that you don't have to wonder if they are too stupid to work it all out themselves. It's very satisfying for someone as pedantic as me...

Except if they were four real people at least one of them would have panicked and immediately taken a wild guess.
 
Here's a couple of riddles for you:
Spoiler :
images


Spoiler :
Hahahahaaha
Spoiler :
Now, admit it! You just knew I was going to show you a picture of some riddles. So I did.
 
Except if they were four real people at least one of them would have panicked and immediately taken a wild guess.

In these sorts of questions, each participant is invariably a totally rational and highly logical person with excellent impulse control. :)
 
In these sorts of questions, each participant is invariably a totally rational and highly logical person with excellent impulse control. :)

Yeah, it's the riddle equivalent of a spherical cow in a vacuum.
 
Oh! Someone post the one about 3 people going to a hotel and $3 in change vanishing! People might not have seen that one...

And in a probability-based version, when should the guy behind the wall (in my riddle upthread) shout out a guess, and when? (He doesn't know who shouted on the other side, just what they shouted)
 
I imagine that as soon as he hears two people call out white or black and hears no gunshots, then he should call out the other colour.
 
They've all got to call out something? I thought only one of them had to.
 
My bad. Which of the four in the riddle speaks next and why?

J

And in a probability-based version, when should the guy behind the wall (in my riddle upthread) shout out a guess, and when? (He doesn't know who shouted on the other side, just what they shouted)

Spoiler :
Well C calls out first as Tim pointed out. B now knows the color of C's hat and knows that D can see both B & C's hats. So if B & C had the same color hat (black) D would have called out white. Since D hasn't called out B concludes his hat is a different color than C's hat and calls out white.

After B calls out I'm not sure at this point. I suppose D could take a random guess. Either he gets shot or not. Either way A knows the color of his hat. :dunno:
 
Hmm.

This is the problem as originally stated:
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.

Who and why?

1. Where does it say that anyone speaks after the first one calls out?
2. Doesn't it also say that everyone gets shot if someone makes a mistaken guess?

So either the problem is poorly defined, or I can't read sentences correctly, or someone's making stuff up as they go.

There's also an assumption (which may or may not be warranted) being made that D can see all three hats in front of him. Why mightn't his vision of B's hat be obscured by C?

And how would D know that B (or was it C?) had called out? It might have been A, or C.
 
Well El Mac was the one who originally posted the riddle so I guess he has the authority to expand upon said riddle if he so chooses.

I suppose since they all get shot if someone guesses wrong, my solution to when A calls out doesn't work out half the time.

Perhaps D can tilt his head his head from side to side which allows him to see B.

I would assume D would be able to differentiate how far away sounds are from him. So when C calls out it seems like he could fairly easily determine the sounds was close to him, so it was very likely not A and probably not B who called out.
 
When C calls out B immediately knows that his is the opposite color, because if his was the same as C then D would have called out immediately...and he knows it was C who called out because of the delay. But D already knows what color B and C were wearing, so he has no more information than he had to start with and all he can do is guess. A now knows where one black hat and one white hat are, but he also does not have enough information to do anything but guess.
 
I think it's an appalling situation in which to find oneself. Not only is one buried up to the neck in sand looking at either a blank wall or the back of someone's head, one has to indulge some crazy executioner's game of hat guessing.
 
At least they are wearing hats instead of burlap bags, and they have tongues so they can call out.

Obscure movie reference:
Spoiler :
Motel Hell, in which the proprietor 'plants' people in the barn after cutting out their tongues to keep them quiet. He then feeds them with a funnel to fatten them up while the immobilization tenderizes them for use in his award winning secret recipe sausages.
 
The humane thing would to to give the poor fellows some chopsticks to dig themselves out.

Spoiler :
Another movie reference.
 
Enough of the old riddle. Here's a new one.

In Feb 2017 the Super Bowl will be played in San Francisco. It is going to be the shortest Super Bowl in more than a generation. Why?

J
 
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