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Three bulbs riddle

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  • 16-09-2005 5:45pm
    #1
    democrates
    Closed Accounts Posts: 2,046 ✭✭✭


    There are three light bulbs in a room, and three light switches outside the room. You are outside, and want to match up which switch goes with which light bulb. You can only travel into the room once, and cannot come back in again. You can do anything you want upon entering the room. How can you set the situation so that you will know which switch goes with which light bulb?


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    #2
    emaherx
    Registered Users Posts: 6,009 ✭✭✭emaherx


    assuming all lights are off
    turn on one for 2 minutes, then turn it off
    turn on the second one and walk in
    the bulb connected to the first switch will be off but hot
    the bulb connected to the second switch will be on
    the bulb connected to the third will switch will be off and cold


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    #3
    KieranusTyranus
    Closed Accounts Posts: 46 ✭KieranusTyranus


    Hes Right I knew it too.


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    #4
    emaherx
    Registered Users Posts: 6,009 ✭✭✭emaherx


    KieranusTyranus wrote:
    Hes Right I knew it too.

    a likely storey :0)


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    #5
    democrates
    Closed Accounts Posts: 2,046 ✭✭✭democrates


    Well impressed, that took me a quarter of an hour to work out when I first heard it.


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