Thursday, June 30, 2011

LIGHT BULBS AND SWITCHES

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 lightswitch goes with which light bulb?
Posted by at 1:29 AM

2 comments:

  1. HimanshuJune 30, 2011 at 1:56 AM

    You turn on 1st and 2nd switches. Then you turn off the 2nd switch after one minute.
    Now you go to the room. The bulb which will be lighted is turned on by 1st switch. Then touch the remaining two. One will be hot, which is turned by 2nd switch. The cold one will be of 3rd switch.

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  2. The New BardJune 30, 2011 at 3:05 AM

    same as above :P
    easy one

    ReplyDelete

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