Lets See if you guys can solve this:P
you need to go through 2 doors(airlock) to get in the room.
but can only enter the room once, & both doors must be closed once you are in.
in the center of the room there is a light.
on the outside of the room there are 3 switches A, B, And C.
you have to tell me how to find the one switch that works the light.
remember No Tricks, extreme logic... you have to find out which switch will turn the light in the sealed room from one shot only:P.
Enjoy:d