Bulb and switch riddle
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You are in a room with three light switches, each of which controls one of three light bulbs in the next room. Your task is to determine which switch controls which bulb. All lights are initially off, and you can’t see into one room from the other. You are allowed only one chance to enter the room with the light bulbs. How can you determine which light switch goes with which light bulb? 
we will on 1 switch for some time then turn it off then on other one then go next room the the bulb hot not glowing is the one running by the switch we turned off the other bulb not hot and not turned on is controlled by untouched switch .rest is obvious
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