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HERE'S ONE
There are two rooms... In the first room there is 3 light switches with a door that leads to the second room. In the second room there is 3 light bulbs.
In the first room each light switch controls one light bulb in the second room. The light switches and bulbs are random.
Being able to go into either room ONLY once how can you figure out which light switch controls which lightbulb?
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