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Originally posted by: PSYCHO_DAYV
THEY ARE SITTING IN A CIRCLE WHICH MEANS THAT THEY CAN SEE EACH OTHER. SINCE THEY ALL RAISED THEIR HANDS IMPLYING THAT THEY SAW A BLACK DOT ON THE OTHERS FOREHEADS THEN ONE WOULD DEDUCE THAT THERE IS A BLACK DOT ON HIS OWN FOREHEAD.
But that won't work because it says that they should raise their hands if they see a black dot on EITHER of the other two applicants heads. You know (by "you" I mean that you are the person referred to in the riddle as being the one who sees black dots on the other two people's heads) that each of them have a black dot, so really all they have to do is see each other's heads and realize that one person of the other two that they are seeing has a black dot. You yourself could have a white dot, but it doesn't matter because they each still see one person with a black dot... each other.