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 Lateral Thinking - Brain Teasers Lights 1,2 and 3 --- Switches A, B and C
 Tue Feb 05, 2013 6:40 pm  by GRhein Adjacent, plain white rooms X and Y are connected by a single door. There are no windows or additional doors in either room. There is no way to peak into one room from the other. -In room X there are three light bulbs: 1, 2 and 3. -In room Y there are three light switches: A, B, and C. -Each light bulb is controlled by one and only one light switch. -When a switch is flipped upwards, it's corresponding bulb is on. -We do not know which light switches turn on which light bulbs. How can you determine which light switch controls which bulb, when: -You may choose to begin either in room X or Y. -You may pass through the door only once. -Once you have chosen to open the door, you must pass through, and cannot look back into the origin room after peering into the destination room. -Any bulb/switch can be on or off at the outset. -These are sturdy bulbs and switches: immune to short circuiting, burning out, and other mechanical failures. ???????
 Thu Feb 14, 2013 2:29 pm  by AnGuSxD I turn on Switch A and turn it of again after some minutes. I turn on Switch B and let it be turned on. And I don't touch Switch C. Now I go to the next room, the Bulb that is on belongs to Switch B, the Bulb that is off but Hot belongs to Switch A and the Bulb that is off and cool belongs to Switch C. :)
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