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Light bulb (Posted on 2002-05-16) Difficulty: 2 of 5
A light bulb is hanging in a room. Outside of the room there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are off and the bulb is not lit.

You are allowed to enter the room only once (the bulb is not visible from outside). How can you determine which of the three switches turns on the light bulb?

See The Solution Submitted by Half-Mad    
Rating: 3.2174 (23 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Solutionwhat about an assistant?Pedro Felipe2007-11-23 01:28:38
Some Thoughtsamazing !!!assaf2007-01-13 11:09:18
Some Thoughts4 switches?Andre2005-09-02 18:00:52
Some ThoughtsSolution... Kind of...Stephen Ticsay2005-04-15 01:37:27
I got it!Lisa2004-04-21 09:36:13
Some Thoughtsre: A Funny Soultionlogischer Verstand2004-04-13 17:21:13
Solutionmy waylogischer Verstand2004-04-13 17:18:23
An interesting wayAllison Smetana2003-04-28 11:08:08
solutionnas2003-01-14 07:31:37
HEY,MEL!YOU LOOKED AT THE SOULTION TO THE PROBLEM YOU CHEATER!Megan2002-09-07 14:47:41
SolutionA Funny SoultionMegan2002-09-07 10:27:30
i know the answer! hehehe i smartMel2002-08-22 11:44:08
only 1 bulbSean2002-05-26 07:29:50
duh!!theBal2002-05-17 09:49:19
Solutionpage4102002-05-17 07:32:13
easytheBal2002-05-16 07:33:30
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