You Are In A Room That Has Three Switches

Your task is to determine which switch controls which bulb.

You are in a room that has three switches.

First switch on the first switch keep it on for say 2 3 minutes. The room is completely sealed off from the outside. On the outside of the room there are three light switches that control each of the respective light bulbs on the other side of the door. Interview question for global customer support representative in mountain view ca you re in a room with three light switches each of which controls one of three light bulbs in the next room.

On the other side of the door is a room that has three light bulbs in it. As soon as u on the second switch go to the room. This is a simple problem. Interview question for candidates day interviews for multiple areas x div back office in new york ny you are in a room with 3 switches which correspond to 3 bulbs in another room and you don t know which switch corresponds to which bulb.

You are allowed one and only one trip to the other room at which time you have to determine which switch controls which bulb. You can not use any external equipment power supplies resistors etc. Punishment for failure to solve this is having to listen to obama speak for an hour. Outside the room there are three switches connected to the bulbs.

Identify each switch with its bulb. We have to go to that room only once. Once you open the door you may never touch the switches again. How can you tell which switch is connected to each of the light bulbs.

Let the bulbs be x y and z. Each light is connected to one of three switches outside of the room. All lights are initially off and you can t see into one room from the other. Each bulb is switched off at present.

You may inspect the room only once. You are standing outside a closed door. It has no windows and nothing can get in or out except through the door. The three switches control three light bulbs in another room.

If you found that the bulb is glowing that means the second switch corresponds to the room. The switches control 3 light bulbs on the other side of the door. You are in a room that has 3 switches and a closed door. You may manipulate the switches as you wish but once you open the door you can t change them.

You are outside the room and the door is closed. Turn on switch x for 5 to 10 minutes. A windowless room contains three identical light fixtures each containing an identical light bulb or light globe. There is a room with a door closed and three light bulbs.

How to wire three switches in a gang box seems a bit daunting just looking at it. You are in a room that has 3 switches and a closed door the switches control 3 light bulbs on the other side of the door once you open the door you may never touch the switches again. Tame the tentacles and provide the power that will allow each fixture to be operated by a dedicated switch.