3 people are standing in a row, one behind the other, all facing the same direction. A man tells them that he has 5 hats, 3 white and 2 black. He will place one on each of their heads. Only the one in the back can see the two in front, and the middle person can see the person in front, but the person in front cannot see the others although they can all hear each other and the man. He tells them how many hats he has and what color they are and they can also hear each other. The woman in the back when asked what color hat he placed on her head says she does not know, the middle woman says the same, but the woman in the front of the row knows exactly which hat she has on her head. What color hat does she have on her head and how does she know this?
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