Elevator Up or Down
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A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why? 
At morning when people go to work they want to go down. If she lives on floor 9 then all the people above her (27 floors) are likely to get down so than why whichever one she takes is three times more likely to be going up than down.
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