Interview Puzzles :: Discussion
Three Bulbs & Light Switches
Youâ€™re in a room with three light switches, each of which controls one of three light bulbs in the next room. You need to determine which switch controls which bulb. All lights are off to begin, and you canâ€™t see into one room from the other. You can inspect the other room only once. How can you find out which switches are connected to which bulbs?
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Asked In : Wipro
28 Aug, 2018 7:14 AM
â€¢ Switch on switches 1 & 2, wait a moment and switch off number 2.
â€¢ Enter the room. Whichever bulb is on is wired to switch 1, whichever is off and hot is wired to switch number 2, and the third is wired to switch 3.