Originally Posted by peter.clickpapa

Alright, here is one for you.

You are downstairs in a house and you have 3 switches in front of you, all in the "off" position. There is one bulb upstairs which is turned off. One and only one of the switches control the light bulb. How do you determine which one of the 3 switches controls the bulb if you can only go upstairs once?

Good luck