Riddles, brain puzzles and mathematical problems

[Bridge]

It certainly can. Nice work BAndrew.

Anyway, all you guys trying to open the door and mess with the switches didn't read the instructions clearly enough. I specifically said: Opening the door counts as entering, and you may only enter the room once. Keeping it open is not a legal move because it is a constant event, whereas the room may only be entered once. But very nice try Chronofox, that was exactly what I did, although I knew it could not be right because of the 1/3 chance of error.

You're up BAndrew.