There are 150 boxes in a line, all closed. In a nearby room are 150 jokers . First joker walks out and opens every box. The second joker then comes out, and closes the 2nd, 4th, 6th,… - all the even-numbered boxes. The third joker comes out and goes to the 3rd, 6th, 9th,… boxes(every third box, in other words), closing any that is open and opening any that is closed, and so on. After all 150 jokers have left the room, what state are the boxes in after the action of the last joker? (answer which boxes are opened and which are closed in the end)
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what a stupid quesrion
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