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From: vorojtsov
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  • Its a little more complicated bcuz the switches can be in parallel in the circuit therefor# u can open all the lamps with 1 switch

  • cleverrrr. i was thinking way to simply... my initial guess was enter the room, leave the door open when you leave the room, and then you can see inside to tell which lamp corresponds to which lamp, but the real answer is much cleverer haha :)

  • Figured it out in 30 seconds, easy, but nice :)

  • easy... turn on all 3 switches and you know they all light up a bulb!

  • look through the windowand go in after to watch tv in the light you just made.

  • Turn 1st on, wait. Turn 2nd on. Go in room. The third is the one that is off. The first is the one with the hot bulb. The second one is the one with the cold bulb.

  • Use your shoe to prie open the door... the look inside at the light while you turn them on...

  • Get a fucking electrician

  • turn 1 and 2 on

    leave 3 OFF

    turn 2 OFF

    turn 1 OFF 15 minutes later

    feel for the cold one = 3

    feel the last two, HOTTER one = 1 and warm one = 2

  • ore just put on all 3 and feel wich one is hot xD

  • Turn one switch on, open the door but don't go into the room. Look which lamp is on, then go back and turn the switch off. Turn an other switch on, go back and check which lamp is on :D Voila you know all three of em ^^

  • look trough the window (Y)

  • intelligent, but don't read the comments, they gave it away

  • 1. Get in the room.

    2. Get the three lamps

    3. Go outside

    4. Plug the lamps in

    5. Turn them on

    :D

  • turn 2 lightst on, after 5 minutes turn 1 off, enter the room, 1 is off, 1 is hot, and 1 is lighted

  • EASYYYYYYYY!!!!!!!! I DINT EVEN HAVE TO VISIT THE SITE!!!

  • sooooo easy turn on everu switch and peek through the door dont enter the room.... duhh................

  • Oh, I was thinking that the whole "you can enter only once" thing was the key, since you can enter the room and have someone else operate the switches. But the heat thing is craftier so I take it that's the answer.

  • It's easy. You leave switch 1 alone, and flick switch 2 for an hour, and then switch back. Flick switch 3. Now look. If the light is on, then the switch is 3, if the light bulb is warm, then switch 2, else switch 1.

  • i tell one like this to my friends all the time. you have to think of what light bulbs generate besides light which is heat. so you turn on light switch one and wait a while. then turn it off and turn on light switch two and go inside. once in the room you see which light is on and thats the lamp that goes with switch two. also you fell the other two light bulbs which ever one is hot is the lamp that matches light switch one. lastly the bulb thats not on or warm goes with the third switch.

  • The lamp A can be seen "outside" (see door): document that switch. Turn on any other switch then "go in", note THAT ONE is on. The third is evident after that.

  • no dude the puzzle is not about that .... let's imagine the bulbs are in a room that is on the other side of your house... having 2-3-4 rooms between you and your 3 switches and the room with the 3 bulbs. So the solution is to turn on switch 1 and 2 ... after about 10 mins or so turn off switch 2 then go inside the room and you will have : one bulb turned on is on switch 1 then put your hand on the other 2 bulbs and the warm one is of switch 2 and the other of switch 3

  • send a friend into the room and then communicate through the door :P

  • turn on one switch and leave it for a minute then turn it off and go in, feel the hulbs and if one of them is warm then one has been on and if not then try again? i dunno im confused

  • kinda but you turn on 2 switches.... then after a while turn off only one from those 2 and then go in the room and voila (one is on, one is off but warm and another one is off) you got them all in one go.

  • first go in the room, come out and leave the door open, and turn on each switch and see which one is on for each switch.

  • @yayyayyay09 i think thats kind of cheating but thats ok with me haha

  • easy -.-

  • I don't need to enter the room at all since if you couldnt tell in the video the door was open ill just look inside to see which switch turns on which light bulb i don't need to enter it to see that when the doors open.

  • your solution was not so abvious to me. because I am so small I can't reach for the bulbs, I can't stand on a chair because I won't put my shoes off, for if I do so I will be affected by my stinky feet.

    so I would rather turn on a lamp and let it burn for like 10 years, turn on an other light and one has to be burnt, or at least less bright than the others, one being turned off, on turned on.

  • Break the wall and proceed with trial and error?=P

  • this is a classic 'thinking outside the box question'.

    you turn on one switch for a few minutes then turn it off. you then turn on the second switch. enter the room. the bulb which is hot but off is the first switch. the bulb which is on is the second switch. and the cold off bulb must therefore be the third

  • Turn on switch one, then go in the room. Take out the light bulb that's on, and one of the others. Flip the other switches and see if light comes from underneath the door.

    The one everyone's putting takes too long.

  • shut up yours sucks everyones else is rigt

  • what if the light bulbs are the ones that don't cause any heat?

  • Spoiler alert!! . . . . . . . . . Turn one lamp on for 20 minutes, the quickly turn it off and turn another one on, then enter the room. There will now be i lamp that is hot, one cold, and one lit. Unless you are an dumbass, you should figure out why this method is correct. Ps: I have not read the solution on his page, and have used only common sense and knowledge to figure this out. Henriko95 out.
  • just open the door and look as u switch each switch =P who needs to be logical!

  • Turn them on one at a time and look in the room to see which does which

  • you're an idiot

  • easy

  • Easy,

    Turn on one switch, and wait for about five minutes.

    Turn off that switch and turn on another one.

    Enter the room. The light that's on belongs to the switch you just turned on.

    The other two bulbs are off, one is hot, which corresponds to the switch you just turned off, and the cool bulb belongs to the third switch, which stayed off all that time.

  • I got an alternative,

    Trust if the lamps can endure for 3 days.. you just take the first one on the first day, second one on the second day and leave the third lamp.

    enter the room on the 4th day and see which one that still works, which one is dead and which one thats off but not dead.

    (Ps: Dont take my comment too seriously :P)

  • great brain teaser! it's nice i've watched it :D

  • Solution :::

    1- turn on the first switch and hold it for a while

    2- turn off the first switch

    3- turn on the second switch

    4- leave the room

    A- one of the lamps will be lit.. that is switch no 2

    B- one of the unlit lamps will be warm.. that is switch no1

    C- The cold unlit lamp will be switch 3 that u didn't touch while you were trying the switches..

    Cheers

  • 1. go in, turn on the S. 1

    2. walk out and remember it

    3. call ur friend to turn on s. 2, then S. 3

    4. that will never benefit you in life (knowing wat switch goes to wat lamp.)

  • My dad use to quiz me on this riddle all the time. Turn on the first switch and leave it on for 5 minutes. turn it off and turn on the second switch then go into the room. The lamp that is on belongs to the second switch. The lamp who's light bulb is hot belongs to the first switch and the lamp who's light bulb is cold belongs to the 3rd switch. This is my all time favorite riddle :D

  • u don't to turn the lights on if ur blind

  • ok, heres how you do it

    1) open the door to the room but dont go in

    2) flicker switch 1 and see witch light flickers

    3) do the same with switch 2 and switch 3

    4) now you know witch goes to witch

    5) you have no need in entering the room at this point unless you need somthing

  • turn two switches on (lets say 1 + 2) leave them on for 2 minutes then turn off number 2 go to the bulbs

    the one that is on = switch 1,

    bulb off but hot = switch 2,

    bulb off and cold = switch 3

    easy

  • 1open the door 2 DO NOT go inside 3 turn on each switch individually and look in each time NOT entering the room.

  • i hope that was sarcasm

  • hahahahhhhaaaaahahahahahahhaha hahahahahahahahaahahahahahahah ahahahahahahahahahahahahahahha hahahahhhhaaaaahahahahahahhaha hahahahahahahahaahahahahahahah ahahahahahahahahahahahahahahha hahahahhhhaaaaahahahahahahhaha hahahahahahahahaahahahahahahah ahahahahahahahahahahahahahahha­ hahahahhhhaaaaahahahahahahhaha hahahahahahahahaahahahahahahah ahahahahahahahahahahahahahahha hahahahhhhaaaaahahahahahahhaha hahahahahahahahaahahahahahahah ahahahahahahahahahahahahahahha hahahahahahahahahhahahahahahah

  • Maybe the ceiling is high so you can't see the lamps unless you go in.

    I think the sollution is that you turn on two lamps, and after a while you turn off one of them, you go into the room check which is on, which is hot and which is cold. Voila.

  • how high would that ceiling be?

  • doesn't matter... just high enough so you won't be able to see the lamps without going inside the room, that's the point. Stop asking stupid questions.

  • Then how would you reach the ceiling?

  • a ladder is inside the room. Or I'll bring one with me.

  • Do they make ladders that tall?

  • LOL

  • there lamps, lamps arent on ceilings.

  • I think the author means light bulbs hanging by a wire from the ceiling not actual lamps. But if he does, screw the ladder!

  • you're too stingy. so you think you're that smart huh? so boastful :P

  • i think i know this one..

    you turn on a switch and leave it there for.. lets say an hour or so? then turn on another switch and go into the room immediately.

    2 lamps are on now..1 is off. one of them will feel hot compared to the one you just turned on. and by entering only once =D

  • dont be cranky :)

  • take all 3 lamps in with u...

  • how bout just getting rid of two lamps and not giving a damn =]

  • I've seen this riddle before, and I know the "official" answer has to do with letting the bulbs get warm. Seriously, though, just leave the door open. Or get a fucking candle...

  • go in once and take the lamps with you when you leave lol

  • Easy, obtain blueprints from the planning commission!

  • -Turn 1 switch on

    -Leave 1 switch off

    -Turn the last switch on for 2-3 minutes and turn it back off again.

    -The switch you turned on will light up 1 bulb.

    -The switch you left off will leave its bulb off.

    -The switch you turned on for a few minutes will allow its bulb to heat up.

    Go into the next room and check for the warm bulb.

    Solved.

  • you're McGyver!

  • seriously

  • Why can someone only go into the room once?

    makes no sense from the beginning!

  • Easy! What if the room had windows? You check it all out, and if the switches are far away, you can use a camera :D

    ~Lord Eyli, giving wrong but at the same time right answers ;)

  • feel for temp... switches on off /on/longer..Or.. leave door open use colored bulbs. Or... send a friend in the room with a a walky talky.... or just yell...... lol.

  • 1. Turn on 2 lamps for a while

    2.turn off one lamp

    3. enter room,

    Switch on = on lamp

    switch that remained off = off cold lamp

    switch that was on then off= off warm lamp

  • just look in the room but dont go in.=D

  • that is so easy!!!my dad taut me that like 2 weeks ago

  • Bill Gates asked this question of 100 people who worked for him, and only one guy could answer it.(i don't remember the whole story)

    The answer was you turn on a light and after a while you turn it off then turn on another light. next you go to the room and see the light that is warmer than the other ones is the one you turned on and then off(the first switch), and the one is already on is the one you turned on second. now there's only one light left which is the one that you never turned on.

  • Spoiler:

    Ok, not all lamps get warm, like fluorescents for instance. So leaving it on for a while doesn't work. Not all fluorescents flicker or delay on start. But all lamps draw current when operating.

    1. Turn on two switches and enter the room

    2. Remove one of the lit lamps and note which are off, on, removed

    3. Using a clamp-on Ammeter check the current on each 'On' switch. The off switch is your off lamp, the switch drawing current is your On lamp, And the last is your removed lamp.

  • interesting... xD

  • So you just have a clamp-on Ammeter on you at all times?

  • :-D

    Only when checking to see which switches control what circuits. ;-)

  • Turn one switch on for a little bit, then turn it off. Turn another switch on. Go in the room. One lamp will be on and if you feel the lamps, another will be warm to indicate the first switch that you turned on. The cold lamp will be the switch that was never turned on.

  • Oh, but what if the lamps were surrounded by a container of lava? :D

    You wouldn't DARE try to touch them :P

    ~Lord Eyli, disproving correct answers, which are at the same time correct ;)

  • look under the doorseal when fiddling with the switches; figure out which light is which by angle of light.

    now, nobody has to even enter the room

  • lol this one is easyer than number 6

    IF YOU DONT WANNA KNOW AWNSER DONT LOOK

    1 2 3 |A B C|

    Switch 1 on for about 1 minute

    turn 1 off

    swtich 2 on and quickly go to the room

    Look and see B is burning

    Feel and A is HOT

    Look and C is off So now you know

  • i know this from long ago so i dont write the answer :P

  • enter the room

    turn on switch 1 for a long time.

    turn off switch 1.

    turn on switch 2.

    now enter the lightbulb room.

    switch 2 willl correspond to the lightbulb that is on,

    switch 1 will correspond to the lightbulb that has been heated (ie the lightbulb that is off AND hot)

    switch 3 will correspond to the lightbulb that is cold.

    the end

  • lol, my friend in primary taught me this

  • But the lamps are cold fluorescents.

    Try again. ;-)

  • enter the main room

    turn on switch 1 for a long time.

    turn on switch 2 and run towards the lightbulb room and enter it.

    lamp 2 will be the one warming up

    lamp 1 will be the one that's the brightest

    lamp 3 will be turned off

    ;-)

  • Ahh, but not all fluorescents delay on start. I like your approach though :D

    Hint: You'll need some basic electrician tools to be used at the switches.

  • wrong about the tool; ever thought of extension cords brainiac?

  • @Blaumark re: Extension Cords

    Most extension cords plug into receptacles (aka outlets) and have little to do with switches 500 feet or more from the lights they control.

    What was your point?

  • /clap

  • lol a couple weeks ago my reading teacher asked my class this question. it was kinda easy.

  • Keep the door open and watch the light from the outside of the room.

  • turn a lamp on.go in room and take one of the off lamps out.then flick the 2 remaining switches to see wat 1 turns on the lamp u brought out.then the last switch not on will be 4 the last lamp in the room that is off:)

  • Light a candle...

  • get all da lamps out of da room n chk da switches or get new connection wires 4 da lamps. if still not happy thn call an electrician,,,lolz

  • turn on switch 1 and switch 2 ,after some time switch off 2 and then enter in the room ,

    one lamp is on at that time and u can check from other 2 lamps which one has some heat emmision which shows the relevant lamp

    then remaining is easy to get

  • Ah, which one shows evidence of being on. :)

    Nice.

  • Thats the right answer!

  • I love intellectuals...

  • i've heard this before. i assume they are all off, turn on two switches, check which ones they are, then go back and turn one off, by process off elimination the remaining switch is correct and the original off is correct leaving the in between known.

  • switch on switches 1 and 2, get into room (at this point you know which lamp correspond to switch 3), remove one of the two lit bulbs, go back outside and switch off switch 1, if there's still light in the room then it (switch 1) corresponds to the removed bulb's lamp, otherwise it corresponds to the lamp with the bulb in it.

    Cheers

  • what would you do if you couldn't see the lamps from the switches and/or you cant remove the bulbs?

  • It's just like gambling.

    If you turn on 2 switches and then enter the room, you've got a 50% chance of guessing which light coresponse to those two switches, and a 100% chance of guessing the off light and switch

  • Get a fucking electrician.

  • wat u do is u leave them all off.. then walk into the room...

    epic fail.

  • The position function of A is t^8. The acceleration of B is twice that of A's. Furthermore, 0.5t^14 is the absounce of C. Assuming "X" is a positive integer,

    When t=0.000000000321181, what is the numerical answer you get when you add the pop of A plus the jerk of B plus the drop of C, minus 0.0000054?

    who know this????

  • wow your smart

  • Conduct your experiments by opening the door, and looking inside, instead of entering the room.

  • you turn the first switch, leave it on for a couple of minutes, enough to have the light bulbs or whatever warm up, then u turn that off and switch another one on and enter the room. The hot one belongs to the first switch, the on one to the current switch, the cool one to the last switch.

  • what if these are super cooling and by the time you enter they are the same temperature?

  • What if the room is a 5 minute walk away?

  • No.

  • i like the way you sayd switch XD

    swiczzhes ore shewizz

  • i think i already heard that:

    turn Switch 1, on then off after some seconds, then turn switch 2 on, then enter, switch 2 lamp will be on, the other 2 lamps correspond to Switch 1 and 3, the hot one correspond to switch 1, the cool one to switch 3.

  • first you turn one of the switches on for like ten minutes, than turn it off. turn another one on than go in the room, the light thats going to be on is the one you just turned on. than which ever one of the other two lights is hot is the one you turned on the first time, and the last one is the one you never touched. BOOO-YA!

  • that is a great answer where did you get it from?

  • Figured it out on my own, there are more answers to it. you just gotta think about it.

  • it says that you can enter the room only once

    so, all ofthe switches can enter at the same time

  • ur voice.......is like a drug. im so sleepy now...*drools and limps over computer with dazed look* im about to pass out..

  • I've seen this one...you turn one two lights...wait ten minutes and turn off one. Afterwards, you go in the room and the one that is on is the first switch. Then you feel which one of the remaining two lights are warm. The one that is warm is the one that was on for ten minutes. TA-DA!

  • what if the lightbulb is one that doesnt heat up?

  • The light bulb cannot 'light up' without the exertion of heat by definition of thermal dynamics. You might not notice it compared to a old fashioned florescent but the emission is still there.

  • flip one switch, wait 5 min. flip two switch wait 5 min. turn them off and enter room. hottest lamp reacted to switch one, second hottest lamp reacted to second switch. not hot lamp reacted to third switch

  • NO need light number 1

    light for 5 mins number 2

    keep 3 off.

    the lit one is number 1, the cold off one is number 3, the hot off one is number 2

  • simple.

    from his diagram it shows that you have a straight look into the middle of the room. where you can see the 2nd switch. find the one that turns that one on. next turn one on that isnt the middle one and go in and see what one that is. the remaining switch and lamp go to each other. that is how you do it.

  • my dad thought of this. Turn TWO switches on and wait a bit. Turn one of the ON ones OFF and enter the room. One lamp on. One lamp off. One lamp WARM.

  • turn on the first switch for 5 min. then turn it off and quickly turn on the second switch.go in the room and try to find the bulb that was hot and not on,thats the first switch,then the one that is lit is the second switch,then the one thats not hot and not lit is the third switch.

  • Alot of people have the idea. But you have stated it the most clearly. You only need to flip 2 of the 3 switches.

  • what if one lamp is broken and you do not know it is broken? find the probability.

  • press one switch and enter the room at this point you know about one of them then in the room switch one of the remaining lamps off and exit. Outside turn off the first lamp and click another switch if light comes out of the room you know you will know that the switch belongs to the one you left on and of it doesn't it will belong to the other one.

    Easy!!!

  • maybe you can't see the room

  • in that case you do it with heat

  • Go in break 1 light bulb,and on a diffrent one on and put a scarf arround it, then turn on the switch, leave it on over night, go back the next day then when it lights on fire and the room burns down you will be able to tell from the lawn what one was what if you go back up and flip the swich to the non broken one.

  • ROFL. That's an awesome answer.

  • I salute you

  • ROFLMAO! Yep, you can see the wires after all the sheetrock falls off the studs LOL

  • trun switch 1 and 2 on then wait a while so the bubs heat up then turn off switch 2 go into the room whichever light is on is switch 1 whicever light is off but is warm from being on for the time you left switch two on is switch 2's lamp and the one thats off and cold is switch 3's

  • that sounds like its right

  • The solution is simple. The condition is you can only ENTER the room once. Simple go and open the door and remain standing outside the room. Flip each switch and observe from the outside which bulb it corresponds to. Simple. :P

  • who ever said that the switches are close to the room. Maybe you can't see inside the room.

  • I've read all the above solutions and they were all interesting. I'll propose my own and it's a very simple solution. The condition is ENTER the room once. So just open the door and don't enter the room, then flip each switch to see which bulb it lights up from outside the room. simple. :P

  • what if the room is up stairs?

  • switch 1 turns on all three lamps because it is a series circuit

  • 3 switches

    3 lightbulbs

    Unfortunately you do not know which of them is turned on or off when you started the experiment.

  • you turn one on for about ten minutes then turn it off. You then turn another on and walk into the room which ever one is on corresponds with the one you just turned on. whichever light bulb is hot, corresponds with the one that you turned off. the other one goes with the switch you did not touch!

  • Yes I agree this is the way to do it.

  • That's good because this really is the way to do it.

  • u keep switch 1 and 2 tunred on for 20 minutes.. then turn off switch 2 and go in.. the one that is still on belongs to swtich 1; the one that is warm but off belongs to switch 2 and the one and that cold and tunred off belongs to switch 3

  • You turn on one switch (lets say switch 1) and enter the room u now see which light it lights up (we will pretend it lights up B)...now while inside the room u remove the light bulb from one of the lamps that didn't light up (we will take out light bulb A)...we leave the room and turn off switch 1 and flip switch 2...if the room lights up (we can see this from outside) switch 2 corresponds to C...if not it belongs to lamp A...right??

  • > if the room lights up (we can see this from outside)

    sorry, one can not see from outside (no information can be transferred when the door is closed)

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