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Three Switches and One Light Bulb
This Medium puzzle in the “logic” category rewards careful reading and step-by-step reasoning. Use the hint if you are stuck, then compare your approach with the explained answer.
You are in a room with three switches labeled A, B, and C. Each switch controls a light bulb in another room. You cannot see the bulb from your current room.
You may turn the switches on or off as you like, but you can only enter the other room once.
How can you determine which switch controls the light bulb?
Preparing…