I think bonanova's solution is brilliant....too brilliant. It's too easy to screw it up when your life is on the line. Why not just speak loudly if the guy in front of you has a red hat and softly if he has a black hat. I don't see anything in the wording of the problem to exclude this answer. Atleast 19 survive...reliably.
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I think bonanova's solution is brilliant....too brilliant. It's too easy to screw it up when your life is on the line. Why not just speak loudly if the guy in front of you has a red hat and softly if he has a black hat. I don't see anything in the wording of the problem to exclude this answer. Atleast 19 survive...reliably.
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