Imagine you are in a big house and you need to match out the 3 switches located in the first floor with the three light bulbs located in the ground floor. In the ground floor there are 3 bulbs (all are off at the moment), each switch belongs to some bulb.
How can you find out, which switch belongs to which bulb?
It is impossible to see from one room to another.
He can only get down only once to check out the bulb.
Only hands are used. No other device.
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