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seven people are in an elevator which stops at ten floors.now consider the situation when no two people get off at the same floor. before the elevator begins to travel, each of them pushes a button for
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seven people are in an elevator which stops at ten floors.now consider the situation when no two people get off at the same floor. before the elevator begins to travel, each of them pushes a button for his or her floor. in how many ways can the elevator buttons be lighted?

User Victor Herrera
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5 votes

This is simple question , answer is 4 ways

User Bulwinkel
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