You are standing in front of a room with one lightbulb inside of it. You cannot !
Question:
You are standing in front of a room with one lightbulb inside of it. You cannot see if it is on or off. Outsid
You are standing in front of a room with one lightbulb inside of it. You cannot see if it is on or off. Outside the room there are 3 switches in the off positions. You may turn the switches any way you want to. You stop turning the switches, enter the room and know which switch controls the lightbulb. How?
Answers:
You turn on switch A and leave it on for like 5 minutes. Then you turn it off. Then you turn on switch B and go to the room with the light bulb. If the light bulb is hot but not on, it's switch A. If the light bulb is on, then it's switch B. If the light bulb is off and cold, then it is switch C.