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Logic problems. The solution to these problems does not usually require a lot of math, but will take some thinking until you find the right approach.
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Each resident of Dot-town carries a red or blue dot on his (or her) forehead, but if he ever figures out what color it is he kills himself. Each day the residents gather; one day a stranger comes and tells them something—anything—non-trivial about the number of blue dots. Prove that eventually every resident kills himself.

Comment: “Non-trivial” means here that there is some number of blue dots for which the statement would not have been true.

(No Solution Yet, 1 Comments) Submitted on 2017-04-20 by Ady TZIDON   
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