Three switches and a lightbulb
"Inside the room there is a lightbulb. Door that closes the room was sealed completely,. So there is no slot through which can be seen inside the room when the door is closed Outside the room there are three switches , but only one of them turns on the light bulb in the room, while the other two off. How would you do to determine which switch is the one that lights the bulb into the room only once ?.
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