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**Kong** · 11-12-2009, 02:43 AM

I posted no before Old Timer.

A room has four lamps each with light bulbs.
All are turned off.
You are outside of the room behind a closed door in a hallway.
There are four light switches in the hallway with you.
The lamps are controlled by these switches.
Each time you flip a switch you can see from the crack beneath the door that a light is turned on or off but you can not identify which lamp you are controlling.
You can not see into the room.
You can flip each switch up to 10 times.
You can open the door and enter the room but once you do so you can not flip the light switches again.
How can you determine which switch controls which lamp?

11-12-2009, 02:43 AM	#29
Donor Administrator 12,331 posts View Stats	Kong Re: Riddles I posted no before Old Timer. A room has four lamps each with light bulbs. All are turned off. You are outside of the room behind a closed door in a hallway. There are four light switches in the hallway with you. The lamps are controlled by these switches. Each time you flip a switch you can see from the crack beneath the door that a light is turned on or off but you can not identify which lamp you are controlling. You can not see into the room. You can flip each switch up to 10 times. You can open the door and enter the room but once you do so you can not flip the light switches again. How can you determine which switch controls which lamp?