Task! How to determine which switch on a light bulb?

This task is very simple, since its solution does not require any special knowledge of electrics. It is only necessary to think a little and using logic to find the right solution. This task will allow you to pass the time at work, little to develop their thinking and just distract from worries.

Task.

Imagine that you are an electrician, and in a house where there are only two rooms. In one room hangs a lamp, and in the other there are three switches. Only one switch is connected to this light bulb.

You need to find which switch is connected to the lamp under the following conditions:

• you are in the room with the switches and see if the bulb lit up in another room;
• you can only once go into the room with a lamp and look at it;
• Do not disassemble switches and use instruments to determine the flush.

First, you are in a room with three switches, and you can click them as you please. This is all that is allowed electrician.

So, how to determine what light switch connected?

I await your answers in the comments !!!