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Posted by Denis Borris on 23/9/2009, 1:28 am, in reply to "Re: Yes. You got it!!"
Boy oh boy,what a nice puzzle. I confess that it
took me another hour before I finally saw d'light!
My explanation goes like this:
These 2 combo's are impossible:
K C G [1]
G K C [2]
These 2 combo's mean SUCCESS:
C G K
G C K
Leaves 2 combo's:
C K G [3]
K G C [4]
[3]: since [1] is impossible, then Alice knows
if she gets G that C K G is only possibility.
So she opens door2.
[4]: since [2] is impossible, then Alice knows
if she gets C that K G C is only possibility.
So she opens door1.
Nick, I now see why you like this one so much!
I posted it at Gameboomers: OK?
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