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Green Eyed Dragons Riddle
http://forum.nogoblinsallowed.com/viewtopic.php?f=14&t=20030
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Author:  Ragnarokio [ Mon Nov 06, 2017 6:06 pm ]
Post subject:  Green Eyed Dragons Riddle

I am guessing a lot of you have already heard this but i just encountered it today and thought it was pretty cool so i decided to share it.

There are three dragons, each with green eyes in a room. They can each see each other's eyes, but not their own. The following statement is said aloud and the dragon's regard it as true: "There is at least one dragon with green eyes". What new information do each of the dragon's gain from this statement?

Author:  UselessCommon [ Mon Nov 06, 2017 6:48 pm ]
Post subject:  Re: Green Eyed Dragons Riddle

1) There is a mysterious speaker in a room.
That's not all there is to it, is it ?

My logical skills fail me...

Author:  Ragnarokio [ Mon Nov 06, 2017 6:54 pm ]
Post subject:  Re: Green Eyed Dragons Riddle

nope, its not really a trick question, i think.

Author:  YingLung [ Tue Nov 07, 2017 9:34 am ]
Post subject:  Re: Green Eyed Dragons Riddle

Assuming that having green eyes makes everything you see look green, the each dragon learns that it has green eyes.

Author:  Lord LunaEquie is me [ Tue Nov 07, 2017 9:46 am ]
Post subject:  Re: Green Eyed Dragons Riddle

You forgot the part where the dragons are only allowed out if they have green eyes.

Author:  YingLung [ Tue Nov 07, 2017 9:57 am ]
Post subject:  Re: Green Eyed Dragons Riddle

Having looked up the solution, it appears that the green eyes is merely a pigmentation of their irises.

The version I read had the condition that when a dragon realises they have green eyes, they must transform into a bird at midnight of that day.

Author:  Yarium [ Tue Nov 07, 2017 11:28 am ]
Post subject:  Re: Green Eyed Dragons Riddle

Also looked up solution, and I can confirm that a REQUIREMENT in the stating of this riddle is that the Green Dragons must leave the room when they discover they have green eyes. Without that, there is no logical reason that the Green Dragons learn any new information.

Author:  Tevish Szat [ Wed Nov 08, 2017 5:56 pm ]
Post subject:  Re: Green Eyed Dragons Riddle

I looked at this thread without having heard the solution, but knew that, from a meta-logical standpoint, each dragon must be able to derive its own eye color as green. There is no other hidden information to a dragon and it wouldn't be much of a riddle if the answer was "nothing happens". However, I couldn't arrive at the mechanism by which this would occur. I looked up the answer, and yeah, the automatic midnight birdification is kind of necessary to the puzzle because it creates the feedback loop of information that eventually leads the dragons to derive their own eye color

Author:  Ragnarokio [ Wed Nov 08, 2017 6:03 pm ]
Post subject:  Re: Green Eyed Dragons Riddle

The bird clause isn't necessary and the solution to this puzzle is different from the solution to the puzzle from which this is derived from. The answer is:

Spoiler

Author:  Yarium [ Thu Nov 09, 2017 8:23 am ]
Post subject:  Re: Green Eyed Dragons Riddle

Ragnarokio wrote:
The bird clause isn't necessary and the solution to this puzzle is different from the solution to the puzzle from which this is derived from. The answer is:

[spoiler]Each dragon learns that from the possible perspective of another dragon, the third dragon can't possibly think that all three dragons have non-green eyes.[/spoiler]


response + answer to the other riddle

Author:  Tevish Szat [ Mon Nov 13, 2017 11:24 am ]
Post subject:  Re: Green Eyed Dragons Riddle

Yarium wrote:
Ragnarokio wrote:
The bird clause isn't necessary and the solution to this puzzle is different from the solution to the puzzle from which this is derived from. The answer is:

[spoiler]Each dragon learns that from the possible perspective of another dragon, the third dragon can't possibly think that all three dragons have non-green eyes.[/spoiler]


response + answer to the other riddle

Spoiler

Author:  Ragnarokio [ Mon Nov 13, 2017 9:30 pm ]
Post subject:  Re: Green Eyed Dragons Riddle

Yarium wrote:
Ragnarokio wrote:
The bird clause isn't necessary and the solution to this puzzle is different from the solution to the puzzle from which this is derived from. The answer is:

--


response + answer to the other riddle


Spoiler

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