Author Topic: Esra #2the Light Bulb (Read 3145 times)

lordly_dragon · « **on:** October 12, 2006, 10:52:22 PM »

you have in front of you 3 switches that power 3 light bulb. the light bulb are on the other side of a door (so you cannot see what is behind). You have permission to go to the other side only once.

GOAL: determine wich switch activate each light bulb.

CK9 · « **Reply #1 on:** October 13, 2006, 01:16:33 AM »

turn one switch on for a while, then turn it off, turn on another switch and go in the room. The light that's on is the one to the switch that is on, feel the two that are off. The warm one goes to the switch you had on earlier. The cold one goes to the seitch you never turned on

Hooman · « **Reply #2 on:** October 13, 2006, 01:54:51 AM »

Hmm, interesting answer. I like that one.

Definately something sneaky has to be going on here. There are 6 possibilities for wiring the lights, and simply turning on 1 or 2 still leaves you with 1 bit of information left unknown. That is, two lights and two switches unknown leaving 2 possibilities. (And turning on 0 or 3 gives you no info).

For this to be solvable, there definately has to be a hidden information source such as the heat of a lightbulb.

Hmm, what about power efficient lights?

lordly_dragon · « **Reply #3 on:** October 13, 2006, 07:24:18 AM »

okay for your information hooman they were normal light bulb and ck9 got the answer right =)

CK9 · « **Reply #4 on:** October 13, 2006, 05:28:32 PM »

it wasn't fair to hooman, I've seen this elsewhere, lol

Hooman · « **Reply #5 on:** October 13, 2006, 08:09:38 PM »

Yeah, I kinda figured he was right. Like I said, I like the answer.

...but due to budget cuts, the light at the end of the tunnel is being switched off.

News:

Author Topic: Esra #2the Light Bulb (Read 3145 times)