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Subject: Knock yourselves out.
Replies: 35 Views: 2498

kid_ka0s 22.03.15 - 08:47pm
You're in a room with three light switches, each of which controls one of three light bulbs in the next room. Your task is to determine which switch controls which bulb. All lights are initially off, and you can't see into one room from the other. You may inspect the room only once. How can you determine which switch is connected to which light bulb? * +

psnality 22.03.15 - 08:49pm
Turning them on? * +

mz.c 22.03.15 - 08:53pm
Call the switches 1, 2 and 3. Leave Switch 1 off. Turn Switch 2 on for five minutes and then turn it off. Turn Switch 3 on and leave it on. Enter the room. The bulb that is on is controlled by Switch 3 (the one you left on). Feel the light bulbs that are off for heat. The bulb that is off and warm is controlled by Switch 2 (the one you turned on, then off). The bulb that is off and cold is controlled by Switch 1 (the one that you didn't turn on). * +

mz.c 22.03.15 - 08:53pm
* +

mz.c 22.03.15 - 08:54pm
I'm still confused. I'm tired so doesn't take much * +

psnality 22.03.15 - 08:54pm
If you turn them on then you can see into the other room so turn them on one by one, simples * +

guyver 22.03.15 - 09:05pm
i cant visualise the problem. you need to draw a picture * +

newt182 22.03.15 - 09:08pm

/thread * +

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