okay here is the dilemma. you have three light bulbs inside a house, and you have three light switches on the outside. you can only go through the door once to check to see which switch turns on which lightbulb, but you have to figure out which switch goes to which lightbulb on all three. How can it be done, by only going through the door once?
nope, no one is right yet. you are the only person there, you cant have help, and you do have to go inside through the door once.
Flick the hell out of one switch for three hours, then turn one on and leave the third off, then go in the house to see which one is on, off and which is burnt out
Hmm. Connect a timer to each of the switches. Set them to turn on left to right, the first at 5 minutes, second at 10 minutes, third at 15 minutes. Walk around and see what order they turn on. Voila.
Leave the first swithc off, turn the second on for ten minutes then off and the third on just before you go in, then the one thats on is the third one the colder of the two that are off is the first and the hott one is the second
I meant you could remove it before you go outside to flip the switches. It wouldn't work anyway, really. If you turned on the switch with the removed bulb, you'd never be able to figure out the remaining 2. I stick by my timer method above.
Oh, I see your point though. It says you can only go through the door once. Not "in through" or something. Most people don't randomly go to strange houses and flip switches outside. Ha ha.