How will you know which switch goes with which light bulb?
There are three light bulbs in a room, and three light switches outside the room.
You are outside, and want to match up which switch goes with which light bulb.
You can only travel into the room once, and cannot come back in again.
You can do anything you want upon entering the room.
How can you set the situation so that you will know
which switch goes with which light bulb?
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Switch on the first switch for 10 minutes to make sure corresponding bulb gets heat. Now switchoff that and switchoff second switch. Now rush to the room. Bulb which is switched on belongs to second switch. Bulb which is hot belongs to first switch and another bulb belongs to third switch.