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Hard Math Riddles: 3 Switches

 

Free Riddle:

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?

Riddle Answer?

Think for a while and when you guess the answer, scroll down to find the answer at the bottom of this page.

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Riddle Answer:

You turn 2 switches "on" and leave 1 switch "off" and wait about a minute. Then enter the room, but just before you enter, turn one switch from "on" to "off".

Once in the room, feel the lightbulb - if it is warm, but off, it has to be the last switch you turned off. If it is on, it has to be the switch left on.

If it is cold and is off, it has to be the switch you left in the off position.

 

  

 

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