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PostPosted: March 28th, 2008, 2:42 pm 
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Joined: March 13th, 2008, 4:14 pm
Posts: 119
You're in a room with three switches: A, B and C.

One of these switches is connected to a light bulb in another room; the other 2 switches are fake.

How can you tell which switch operates the bulb when you are only allowed to flick the switches once? i.e. you flick the switches into whatever position you want. Then when you're happy, you leave the room and walk down the corridor into the room with the light bulb in (once you leave the room with the switches, you are not allowed to go back in :shock: ). You note the state of the bulb and determine which switch operates the bulb.

Note that you are not allowed to dismantle the switches, or tamper with them in any way whatsoever (this is to prevent you from testing the circuits with an electrical screwdriver for example).

When you flick the switches you cannot see the light bulb or the light from the bulb - there are 2 closed doors between you and the light bulb (with no gaps under the doors, etc :evil: ).

It's not too difficult this one, so I thought I'd post it in the easy section (plus I wanted to be the first to post in here :D ).


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PostPosted: March 28th, 2008, 2:59 pm 
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Joined: March 13th, 2008, 12:02 pm
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Turn off all the switches and then turn the first switch on. Wait a bit then turn off that switch. Turn on the second switch and go upstairs. Feel the lightbulb. If it's warm then the 1st switch is the one. If it's cold then the third switch is the one. If it's on then the second switch is the one.

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PostPosted: March 28th, 2008, 3:14 pm 
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Joined: March 13th, 2008, 4:14 pm
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Well, I did say it was quite easy, but I thought it might have taken slightly longer than 17 minutes before someone solved it :cry: .


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PostPosted: June 27th, 2008, 10:00 am 
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Joined: June 26th, 2008, 12:44 am
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I would just use my x ray vision


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PostPosted: September 15th, 2013, 11:21 am 
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Joined: September 14th, 2013, 1:38 am
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k2xl wrote:
Turn off all the switches and then turn the first switch on. Wait a bit then turn off that switch. Turn on the second switch and go upstairs. Feel the lightbulb. If it's warm then the 1st switch is the one. If it's cold then the third switch is the one. If it's on then the second switch is the one.

Awesome answer.. Yes it is the way to check old light bulbs but not new ones:0


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