Bulb Problem

You are in the basement of your house where you have three light switches. The lights themselves are located on the top floor and are turned off. However, you do not know which switch is connected to which bulb. You can go upstairs only once to check the results after you are done with changing the light settings (i.e. turn switches).

Given these restrictions, how do you find out the connectivity between all switches and bulbs?

See solution or ...

... go back to Main Page.