Room A has 3 switches.
Room B has 3 light bulbs.
You can only go to Room B for once.
How do you know which light bulb belongs to which switch?
Answer:
1. Turn on one switch for a few minutes. Turn it off.
2. Turn on another one and then go to Room B.
3. There will be only one lighted bulb in Room B and two that are switched off.
4. One of them will be hotter than the other coz you've just turn it on just now.
So, do you get it?
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