You are standing next to three light switches. You know these switches belong to three bulbs in a room behind a closed door, and it’s absolutely impossible to see if any bulb is on or not. All three switches are now in the “off” position.
You can do whatever you want with the switches, and when you are finished you must open the door and go into the room to determine which switch belongs to which bulb.
HOW WILL YOU BE ABLE TO TELL?
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