Hint to Puzzle #39: 100 Prisoners in a Line, Red & Blue Hats and the Executioner
This puzzle is pretty tough. There appears to be no mechanism by which useful information can be passed forward, whilst also allowing the person giving it to survive.
Whilst thinking about it it may help to consider the following smaller set.
The only clue I can think of is a big one. I struggled with this puzzle and I saw one word on a page and the answer was obvious. So big is the clue that I'm going to hide it for now until you are sure you want it...
The word I saw was 'odd.'
The information under consideration revealed and carried forward pertains to odd or even numbers.
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