Quiz 2

INtRA

Back to Mini site Home                                                                    Back to Quiz page

There are three light switches on a wall outside a door. One of them will
turn on the light inside the room. There is no way to see inside the room
before entering.

You can only switch on one switch at any one time.
 

You can only enter the room once. How can you know, after entering the
room, which switch turns on the light?
 

e-mail right answers to Andrew Lacey with 'quiz' in the subject (for junk filter). Prizes for the winner.