You are standing outside the closed door of a small room ..
…
You are standing outside the closed door of a small room.
On the left hand external panel are 3 light switches.
Inside the room is only one lightbulb.
The door can only be opened if all the switches are in the OFF position.
Only one of the switches turns the light on.…
Which one?
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petebowes.com 
The green one.