Quote:
Originally posted by hot_pastrami
There are three light bulbs in a room with no windows, and a closed door. In front of you are three switches. You know that each switch controls one of the light bulbs inside the room, but you don't know which switch matches which bulb, and they are not wired in any particular order.
Your job is to match each switch to it's bulb. You may only enter the room once, and you may not leave the door open. How do you accomplish your task?
|
Flip the first switch. Wait about 2 minutes. Turn it off, flip the second switch. enter the room. The lit light is controlled by switch 2. The off, but warm light is connected to switch 1. The last light is controlled by 3.
