Logic Puzzle
There are four individuals standing in a straight line. Two of them (nr.1 & 3) wear a black hat and two of them (nr.2 & 4) wear a white hat. They are all facing the same direction and between nr.3 and nr.4 stands a brick wall (see picture). So nr.1 can see nr.2 & 3, nr.2 sees nr.3, nr.3 sees only the wall and nr.4 doesn’t see a thing. The men know that there are two white and two black hats.
The individuals are allowed to leave if one of them can say what color hat he is wearing. The men are not allowed to talk. The only thing they may say is “I’m wearing a white/black hat”. If one of the individuals knows which hat he/she is wearing he/she must tell it and all will be free to leave.
Which individual knows 100% sure what color hat he/she is wearing?
=> 1 2 3 l l 4
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