Woman and Elevator

A woman lives in a skyscraper thirty-six floors high and is 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?




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In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.