Light Bulb
Posted: Tue Dec 05, 2006 3:11 pm
You stand before 3 lightswitches. One of these switches is able to turn on/off a lightbulb in a room nearby.
You can't see in the room but you know the light was turned off all day.
You have to find which switch is connected to the lightbulb.
In order to find the switch that is connected to the lightbulb, you can do only the following:
Step 1: Use zero or more switches as much as you want.
Step 2: Go to the other room.
Step 3: Tell which switch is connected to the bulb without exiting the room.
You cannot go back to the switch room and only get one attempt.
You can't see in the room but you know the light was turned off all day.
You have to find which switch is connected to the lightbulb.
In order to find the switch that is connected to the lightbulb, you can do only the following:
Step 1: Use zero or more switches as much as you want.
Step 2: Go to the other room.
Step 3: Tell which switch is connected to the bulb without exiting the room.
You cannot go back to the switch room and only get one attempt.