Hinweis: Die ursprüngliche Aufgabe "Which switch?" stammt von Hr. Niedermaier.
There are three electrical switches (dt.: Schalter) on the wall. You can turn on a lamp in the basement with one of the three switches. But you don't know which one. The lamp is an old fashioned light bulb with a thin electric wire.
You are only allowed to go down into the basement once to look and see if the light is on.
