Can you solve the 3 Switches and 1 Bulb PUZZLE Lateral Thinking Question
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Now that I think of it, I'm not sure if that would work for the 3 bulbs version of this puzzle. But I'm wondering if there IS an actual mathematical solution to both versions, that doesn't involve touching the bulb.
Date: 2023-11-15
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Comments and reviews: 29
sai
I remember back in JR high I was serving 3 days in house dentition (A whole school day plus after school until 5: 30pm in dentition room.
On my last day of detention at 3: 30pm which was the end of the day for school also a Friday the teacher asked if one of us can figure out this riddle that person can go home early.
Out of 10-13 students I was the one who figured this out and was let out early to go home.
I am 25 now till this day it was probably the best Friday ever. Lol
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I remember back in JR high I was serving 3 days in house dentition (A whole school day plus after school until 5: 30pm in dentition room.
On my last day of detention at 3: 30pm which was the end of the day for school also a Friday the teacher asked if one of us can figure out this riddle that person can go home early.
Out of 10-13 students I was the one who figured this out and was let out early to go home.
I am 25 now till this day it was probably the best Friday ever. Lol
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David
A bulb only? What about the rest of the lamp? It wont light up with just a bulb (which is the outer portion of a lamp. Also, flipping and holding switches 1 and 2 on is not the only solution. Also your solution didn't wait long enough for the -bulbs- to cool. You stated all the switches were initially off, but how do you know someone didn't have them all on for 1 hour, flipped them off, then quickly let you in the room to solve the puzzle? Downvoted.
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A bulb only? What about the rest of the lamp? It wont light up with just a bulb (which is the outer portion of a lamp. Also, flipping and holding switches 1 and 2 on is not the only solution. Also your solution didn't wait long enough for the -bulbs- to cool. You stated all the switches were initially off, but how do you know someone didn't have them all on for 1 hour, flipped them off, then quickly let you in the room to solve the puzzle? Downvoted.
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Christian
The green plant hanging suggested to me the solution -:
I switch #1 on for ten minutes, then after turning it off I quickly switch #2 and #3 on, then turn #3 off. If now I open the door and check inside the room I can find what follows:
1) bulb cold and light off, solution is button #3
2) bulb cold and light on, solution is button #2
3) bulb hot and light off, solution is button #1
Cheers!
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The green plant hanging suggested to me the solution -:
I switch #1 on for ten minutes, then after turning it off I quickly switch #2 and #3 on, then turn #3 off. If now I open the door and check inside the room I can find what follows:
1) bulb cold and light off, solution is button #3
2) bulb cold and light on, solution is button #2
3) bulb hot and light off, solution is button #1
Cheers!
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bluerfoot
Can't you just switch 1 on for a while and then turn it off and turn on switch 3 and open the door? if the room is dark you know 3 did not make a difference so you feel the bulb. If it is warm then it was switch 1, if it is cold it was switch 2. If it is light when you walk in you know it was switch 3 and don't even have to touch the bulb.
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Can't you just switch 1 on for a while and then turn it off and turn on switch 3 and open the door? if the room is dark you know 3 did not make a difference so you feel the bulb. If it is warm then it was switch 1, if it is cold it was switch 2. If it is light when you walk in you know it was switch 3 and don't even have to touch the bulb.
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Mahindra
lets switches be switch1, switch2, switch3;
on switch1 and switch2 for long time
then off switch1 and on switch2 and switch3 then enter the room immediately.
if light is off then answer is switch1
if light is on and hot then answer is switch2
if light is on but not hot then the answer is switch3
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lets switches be switch1, switch2, switch3;
on switch1 and switch2 for long time
then off switch1 and on switch2 and switch3 then enter the room immediately.
if light is off then answer is switch1
if light is on and hot then answer is switch2
if light is on but not hot then the answer is switch3
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Jeremy
Same concept and result just slightly different.
Turn in bulb 1, wait a while and turn it off, turn on bulb 2 and go inside. (Still flipping a total of 3 switches just a little differently)
If bulb is hot but off, it-s switch 1
If bulb is on it-s switch 2
If bulb is off and cold it-s switch 3
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Same concept and result just slightly different.
Turn in bulb 1, wait a while and turn it off, turn on bulb 2 and go inside. (Still flipping a total of 3 switches just a little differently)
If bulb is hot but off, it-s switch 1
If bulb is on it-s switch 2
If bulb is off and cold it-s switch 3
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Karthikeyan
What if the bulb is right on the ceiling out of reach? Better yet, you know there is a bulb but not exactly where in the room it is (centered on ceiling, near the corners, above or centered on the wall. Also most modern bulbs (LED/CFL) do not get hot.
This is an incomplete problem
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What if the bulb is right on the ceiling out of reach? Better yet, you know there is a bulb but not exactly where in the room it is (centered on ceiling, near the corners, above or centered on the wall. Also most modern bulbs (LED/CFL) do not get hot.
This is an incomplete problem
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MrMousley
My solution. before I look at yours.
Turn on switch 1 and 2 for 5 minutes or so
Turn off switch 2
Go into the room
If the light is on it's switch 1
If the light is off but the bulb is hot it's switch 2
If the light is off and the bulb is cold it's switch 3
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My solution. before I look at yours.
Turn on switch 1 and 2 for 5 minutes or so
Turn off switch 2
Go into the room
If the light is on it's switch 1
If the light is off but the bulb is hot it's switch 2
If the light is off and the bulb is cold it's switch 3
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MyKazam
Better explanation would have been: turn on switch 1 and leave it on for one hour then switch it off, then turn on switch 2 and walk in the room. If the bulb is off and hot, it-s switch 1. If the bulb is on, it-s switch 2. If the bulb is off and cold, it-s switch 3.
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Better explanation would have been: turn on switch 1 and leave it on for one hour then switch it off, then turn on switch 2 and walk in the room. If the bulb is off and hot, it-s switch 1. If the bulb is on, it-s switch 2. If the bulb is off and cold, it-s switch 3.
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Pooja
Most of the people are saying they will switch on all the switch but how do you will know which is correct bulb
If I am wrong then tell me or not then hit a like
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Most of the people are saying they will switch on all the switch but how do you will know which is correct bulb
If I am wrong then tell me or not then hit a like
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uberfu
The cracks around the door will let light shine through unless it's water (submarine) or light (darkroom) tight or hermetically sealed. If it's a regular door -- look at the edges -- if you see light - the switch worked then open the door.
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The cracks around the door will let light shine through unless it's water (submarine) or light (darkroom) tight or hermetically sealed. If it's a regular door -- look at the edges -- if you see light - the switch worked then open the door.
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ChillMode
I have two solutions.
Smash a hole on the door so that you can see the bulb. Keep in mind that you are not -opening- the door.
ANother solution is to check the wires within the switch to find out which has a connection.
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I have two solutions.
Smash a hole on the door so that you can see the bulb. Keep in mind that you are not -opening- the door.
ANother solution is to check the wires within the switch to find out which has a connection.
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Neo
No time limit eh?
Include a 4th switch, leave it on for 10, 000 hours, then flip it on and off 10, 000 times, then perform the usual routine for the first 3 switches.
- If the bulb is burnt, it's the 4th switch: D
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No time limit eh?
Include a 4th switch, leave it on for 10, 000 hours, then flip it on and off 10, 000 times, then perform the usual routine for the first 3 switches.
- If the bulb is burnt, it's the 4th switch: D
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jatin
At 0: 24 the picture shown by u of a room which has bulb and the closed door no window how's it possible to see a bulb in a dark when there is no source of light to enter the closed room except the bulb which is off
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At 0: 24 the picture shown by u of a room which has bulb and the closed door no window how's it possible to see a bulb in a dark when there is no source of light to enter the closed room except the bulb which is off
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Sanahas
i would switch ON 1 for 10 min then OFF, then switch ON 2 and go in the room. If the bulb is ON, then 2 controls the bulb, if it's off and hot I'll know its 1, if it's not HOT or ON I'll know its 3.
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i would switch ON 1 for 10 min then OFF, then switch ON 2 and go in the room. If the bulb is ON, then 2 controls the bulb, if it's off and hot I'll know its 1, if it's not HOT or ON I'll know its 3.
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Alex
Turn on switch 1 leave it on for ten mins then turn 1 off and turn 2 on and open the door if the light is on the it-s the 2 switch if it-s off and hot its 1 or if it-s off and cold it-s the 3 switch
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Turn on switch 1 leave it on for ten mins then turn 1 off and turn 2 on and open the door if the light is on the it-s the 2 switch if it-s off and hot its 1 or if it-s off and cold it-s the 3 switch
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Jason
Wow, this is an old, but good, one. I remember first hearing this riddle back in 1995. I was able to solve it, but it took me a few days before the solution suddenly struck me: )
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Wow, this is an old, but good, one. I remember first hearing this riddle back in 1995. I was able to solve it, but it took me a few days before the solution suddenly struck me: )
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Chris
This is no longer a valid puzzle. With LED bulbs there can be no discernible heat produced. You must state that the bulb is incandescent, but then that would give the game away.
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This is no longer a valid puzzle. With LED bulbs there can be no discernible heat produced. You must state that the bulb is incandescent, but then that would give the game away.
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Jamm
Fip one switch for 10 minutes then turn it off. Fip another switch and enter the room. If the light is off and cold then the switch you did not flip is the one, etc.
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Fip one switch for 10 minutes then turn it off. Fip another switch and enter the room. If the light is off and cold then the switch you did not flip is the one, etc.
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Guust
Turn switch 1 on, check the kWh meter if it runs faster, repeat for other switches, switch witch highest power consumption is the switch that turns on the light.
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Turn switch 1 on, check the kWh meter if it runs faster, repeat for other switches, switch witch highest power consumption is the switch that turns on the light.
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Aum
1 step i will open the door
I will try all the buttons on and off.
If the light comes out of the room when the button is on. The button is of the room.
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1 step i will open the door
I will try all the buttons on and off.
If the light comes out of the room when the button is on. The button is of the room.
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Farid
And what if switches are installed upside down (so they seem to be off, but bulb is actually already on? It's common case in some houses. Not for real life.
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And what if switches are installed upside down (so they seem to be off, but bulb is actually already on? It's common case in some houses. Not for real life.
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Souvik
A a puzzle should have a salution that no one even expected like your other puzzle but but it has so expected answer that did even seem like puzzle to me
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A a puzzle should have a salution that no one even expected like your other puzzle but but it has so expected answer that did even seem like puzzle to me
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Michael
Now all you need is three perfectly logical people, each of whom can deduce that the others will deduce that he will deduce their deducing.
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Now all you need is three perfectly logical people, each of whom can deduce that the others will deduce that he will deduce their deducing.
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It's
Turn on all the switches and then go to the room then remove the bulb and short the wire together. And check which switch is blown up.
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Turn on all the switches and then go to the room then remove the bulb and short the wire together. And check which switch is blown up.
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SUBHASH
ek ghar m teen balb or teen chatakni h or teeno alag alag h ek bar m kese pta chalega ki konsi chatkni konse balb se judi h
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ek ghar m teen balb or teen chatakni h or teeno alag alag h ek bar m kese pta chalega ki konsi chatkni konse balb se judi h
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CSharpe67
This doesn't work for LED bulbs - as they don't get hot. It needs to say an incandescent/halagon bulb is in the room.
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This doesn't work for LED bulbs - as they don't get hot. It needs to say an incandescent/halagon bulb is in the room.
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Saurabh
why turn two switch on at start it can be done by just one button at start and then turn it off and turn another on
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why turn two switch on at start it can be done by just one button at start and then turn it off and turn another on
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Aryan
what if the bulb didn't illuminate with the switch 1 and 2? How would you know that 3rd switch is the correct one?
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what if the bulb didn't illuminate with the switch 1 and 2? How would you know that 3rd switch is the correct one?
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