

It depends on what type of person designed the circuit and what type of person you are.
Ergonomics: The switch closest to the door first, then mid, then far, figuring the unknown user would click the switch closest, a skilled electrician would start there. However, it’s not unreasonable for the electrician to ask the owner, so this is a hit-or-miss approach.
Installation efficiency: The installer refused to mark any of the lines and instead hooked them up at random, flip in any order, when you find the right one, return the others to the original state.
time efficiency: the energy cost to flip all three switches is minimal and you’re only going in once, flip all three at the same time. you’ve done maximum effort and maximum time savings.
Error reduction, binary counter, all combinations tested in case of chained switching
Debugging: binary counter, followed by checking the lightbulb, possibly swapping for another if one is nearby, checking all the other switches near the room, breakers, power to the structure, and asking an occupant for assistance as a last resort.
Disaster recovery: locate a flashlight or use your phone’s torch/flashlight function.
Ahh crap, other room.
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ask an occupant
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shove a penny in the socket behind the light bulb and listen for a breaker to pop
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turn all three on
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slide your cell phone under the door with video recording on, stomp on the floor hard every time you flip a switch
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turn all the switches through a binary counter looking for one that seems to do nothing.






I had a ddos in 01, took the entire cluster down for a fairly popular website.
Traffic distribution was very wide; everything was on port 80.
All the traffic would come in, smack the front page, then disappear.
Turns out marketing had purchased an ad on MSN which was a hot search engine at the time, we were supposed to be the top link for any search with “school, education, classes, tutoring”. MSN accidentally made us the top link for EVERY search term. My T1 and my BGP frame connection were balls to the wall for 3 days.
OBV, this isn’t marketing, but they’re not a great target. No one’s getting any money from it, They don’t have any stiff corporate competition.