A Logical Puzzle

Discussion in 'Off-Topic' started by BoyntonStu, Apr 21, 2009.

  1. BoyntonStu

    Thread Starter Active Member

    Apr 18, 2009
    52
    0
    There are 3 lamps in a sealed room, each lamp is on a table, they are A,B,C

    There are 3 SPST wall switches on the wall outside the room, and each switch controls a single lamp inside the room. They are 1,2,3.

    You can not see the effect of turning on any switch when you are outside the room.

    You can manipulate the switches in any way.

    After you are done with the switches, you may enter the room once and close the door behind you.


    How can you determine which switch controls lamp A, B, and C?

    BoyntonStu
     
  2. vvkannan

    Active Member

    Aug 9, 2008
    138
    11
    Switch ON 1 for some time and it will get heated.Now press switch 2 and enter the room.The glowing BULB corresponds to 2,heated one to 1
     
  3. Dave

    Retired Moderator

    Nov 17, 2003
    6,960
    144
    The family had some fun with this puzzle at Christmas. It's a good one.

    Dave
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    This puzzle works best with incandescent bulbs, and more poorly with LED bulbs.
     
  5. m4yh3m

    Senior Member

    Apr 28, 2004
    186
    42
    I look at the schematics to the room and see how the wiring is laid out. Then I question the sanity of someone who builds a room only to seal it off and make logical questions of it.
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    The room was part of President Obama's economic recovery plan.:D
     
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