Thread: Queen's Heads Puzzle
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Old 07-21-2010, 12:54 PM   #10
omk3
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Join Date: Dec 2009
Location: Europe
Device: pocketbook 360, kindle 4
Spoiler:
I pick up my 21 coins at random. I have x heads, and 21-x tails.
The gaoler has 21-x heads.
If I flip all my coins over, I now have 21-x heads, and x tails.
So I will always have the same number of heads as the gaoler, and always go free. Yay!
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