# 3 rooms 3 bulbs

1. Jul 26, 2007

### junk

there are 3 rooms upstairs each room has one light bulb but the switches for the bulbs are situated downstairs and you dont know which switch corresponds to which bulb. the switches are turned off initially ... you can turn on/off the switches any number of times you want, you can go upstairs only ONCE and need to figure out which bulb(room) corresponds to which switch. You cant get anyones assistance for this and you need to figure out yourself. do u know how.

The problem is I dont know the answer to this question

2. Jul 26, 2007

### turbo

Assuming incandescent bulbs, this is a really EASY one. Just think about it.

3. Jul 26, 2007

### dontdisturbmycircles

flick on two of the switches, wait 5 minutes, turn off one of the two switches you originally turned on, go up stairs, check to see which one is still on, obviously corresponding to the switch you flicked on but did not flick off again. Then go to both lights that are off and see which one is hot to the touch.

end of text

4. Jul 26, 2007

### turbo

Yep, that's how I figured it too.

5. Jul 26, 2007

### dingpud

Yep yep....

And it is also probably assumed that time really isn't a factor. Which, if that's true, you could almost do it with flourescents as well.

6. Jul 26, 2007

### junk

OK this is suppose to be the correct answer aparently. tx guys

Last edited: Jul 26, 2007
7. Sep 11, 2007

### mohmom

firstly get on one of the switches for 10 min or less
then get it off
2nd... get on one of the switches and keep it on .
go up stair and feel wich one of the off light is warm and wich one the cold
the warm one is no.1
the on light is no.2
the off light is swich no.3

:rofl: