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Rich's Which Switch?
Posted: Wed Apr 14, 2010 3:15 pm
by Richard Priest
This was given to me by a friend -
In a house, one room has 3 light switches, one of which (and only one) switches on the lights in the room next to it.You can only go into the adjoining room once.How are you going to work out which one of the 3 switches controls the lights in the next room?
No prizes I'm afraid.
Re: Rich's Which Switch?
Posted: Wed Apr 14, 2010 3:33 pm
by Jon O'Neill
If I assume that one of the switches also works the light in the first room, I think I can do it. Is that a reasonable assumption?
Re: Rich's Which Switch?
Posted: Wed Apr 14, 2010 3:45 pm
by Richard Priest
Not really on the right lines there Jono, sorry mate.
Re: Rich's Which Switch?
Posted: Wed Apr 14, 2010 5:41 pm
by Ian Volante
Leave the door open while you flick each switch in turn. Conversely, go into the other room and reach round to the switches.
As a real answer however:
Turn on switch 1 for a while. Turn it off again, then turn on switch 2 and leave it on. Go into the other room and if the light isn't on, check if it is warm. Warm =1 switch 1, on =2 and otherwise it's 3.
Re: Rich's Which Switch?
Posted: Wed Apr 14, 2010 11:30 pm
by Phil Makepeace
Wasn't this one of the tasks that Derren Brown used to determine who he picked in his Russian Roulette stunt? It's a cute solution.