there are 3 switches on the ground floor of a building. every switch has a bulb corresponding to it. one bulb in on the ground floor the other on the 1st floor and the third bulb is on the second floor. you cannot see any of the bulbs from the switchyard and neither are you allowed to come back to the switchyard once you check the bulbs. how will you find that which bulb is for which switch?
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If there are three switches then you can simply switch the two of them on say switch 1 and 2 then after few minutes switch 2 one of them off.
Then visit the floors, the bulb that is on will be the switch 1, the one with limited heat around it will be the second and the one with no heat at all will be the third one.
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