Okay, new riddle. You're in a a bedroom with three light switches. You know for sure that one of them turns on a light in another bedroom. You have no way of knowing whether the light is on from the bedroom with the light switches. How is it possible to leave the bedroom with the light switches only once and definitely know which switch turns on the light. |
Ive got it...
Turn switch #1 on for 30 seconds, then turn it off, and turn switch #2 on and walk into the other room.
If the bulb is warm and off, the 'culprit' is Switch #1.
If the bulb is on, switch #2.
If the bulb is off and cold, switch #3.