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Название: Puzzle math
Авторы: Gamov G., Stern M.
During the summer of 1956, one of us (GG) was visiting San Diego, California, as a consultant to Convair, where the other of us (MS) holds a permanent position. We had to discuss many (classified) problems together and since the office of one of us (MS), on the sixth floor of the main building, was more comfortable, the other (GG) would usually take the elevator from the second floor, where his office was located. In doing so, one of us (GG) began to notice that when he arrived at the elevator on the second floor and pushed the button, the first car to come would usually be going in the wrong direction; that is, down. In fact, in about five cases out of six, the first car was going down and only in one out of six was it going up.