There is a wall with 1000 closed lockers on it. A person walks down the hall opening every other locker. Then the next person opens every 3rd locker. The next opens every fourth locker. The next every fifth locker.
Once this has been done, how many lockers are still closed?
The solution to this depends largely on the method which the people follow when opening the locker doors. Once this is established, figuring out th eanswer comes down to arithmetics.
Comments from our visitors suggest some possible assumptions/solutions.
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