Brain Teaser:

Put Your Critical Thinking Skills to Use

There are 3 light bulbs in a room. The 3 switches that operate those bulbs are outside the room, and there is no window to see into the room from outside – just a solid door.  You need to figure out which switch operates which light bulb, but you can’t reach the switches if you’re holding the door open to look. There’s no one there to help you.  How would you figure out which switch operates which bulb, if you only have one shot at figuring it out?

  • You can flip the switches to turn the lights on and off as much as you like
  • You can only go into the room once:  once you open the door, you can’t go back and change the switches

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