Can you solve the famously difficult green-eyed logic puzzle? - Alex Gendler

Комментарии: 7 323

  • Billy Badass
    Billy Badass 2 часа назад

    I’d rather tell them to stand in the water at night when the moon is full and look down. They will see their reflection in the water and will know their eye color. The dictator can’t put the entire ocean in opaque bottles.

  • Candy Apple
    Candy Apple 8 часов назад +1

    How are they perfect logicians if they've never been able to communicate with anyone and learn anything?

  • Allie_Bobbers 0458
    Allie_Bobbers 0458 День назад

    What about "the person next to you has green eyes?"

  • Dragon Edge
    Dragon Edge День назад

    Well then I would just assume I have green eyes because everyone else have green eyes

  • gmmg
    gmmg 4 дня назад

    Everyone you know has green eyes. They already know it and it would mean that if it applies to everyone, they must have it too. That way everyone gets off the island almost instantly.

  • Linda Emiliani
    Linda Emiliani 5 дней назад

    I love to see videos

  • LeoBCooper
    LeoBCooper 5 дней назад

    Everyone around u has green eyes, boom, nothing new, they all already know that

  • Minnie Moouse
    Minnie Moouse 5 дней назад

    If they are perfect logicians, why did they not just spill the water in their container?

  • Stefan Kuls
    Stefan Kuls 6 дней назад

    The shown solution is wrong on multiple levels: 1. The prisoners don't know whether your statement is still true in a reduced 2 prisoner problem. When reducing to two prisoners they gain new knowledge (you would also be killed in this scenario for saying that there is one green-eyed person among only two). This new knowledge is then "transmitted" to the 100 prisoner problem via induction.
    2. The strategy to wait as many days as you see green-eyed people definitely works, but it takes a lot of days. If one of the prisoners could come up with the fastest strategy where every one could get away with certainty. Then every prisoner would as perfect logicians definitely get to the same conclusion and agree with the plan.They could use the greeting as a reference point to start counting. I myself have one strategy (maybe the fastest) that takes only 5 days for everyone to get away. That strategy has some mindblowing consequences (for me) and I would love to share if someone is interested.

  • Kyle Mac
    Kyle Mac 7 дней назад

    I'd say that the person on your left has green eyes.

  • iiRainbowGamer
    iiRainbowGamer 7 дней назад

    They should spill the water on the ground and look in the reflection

  • Yves Kummer
    Yves Kummer 7 дней назад

    I would just look in the sunglasses of the mad dictator, and see my reflection

  • last shadow
    last shadow 8 дней назад

    well if you see all 99 people with green eyes its very probable that you do to

  • BronzeSpaceComet
    BronzeSpaceComet 8 дней назад

    I'm a little confused why you can't say "at least 99 of you have green eyes." Doesn't everyone already know that, so you're not giving any new information? Please clear this up, thx :)

  • Michael MAnville
    Michael MAnville 9 дней назад

    I believe the correct thing to say is "I suggest you all ask to leave.".

  • CAT1554
    CAT1554 11 дней назад +1


  • Lenos Original
    Lenos Original 12 дней назад

    Its much easier because the prisioners will see that everyone has the same eye color and that HE must be diferent and because you said that only one has green eyes every single one of them will think theirs is green on the second day

  • Kat Shvets
    Kat Shvets 12 дней назад

    The real question is what did they’re do all day if they weren’t aloud to talk?

    • Prince M
      Prince M 8 дней назад

      Kat Shvets play video games

  • Samita Pan
    Samita Pan 12 дней назад

    I would have said "you are all the same"

    • Prince M
      Prince M 8 дней назад

      Samita Pan new information

  • Tracy Xu
    Tracy Xu 15 дней назад

    If the water bottles were opaque, just dump it out

  • Bella Campbell
    Bella Campbell 15 дней назад

    I would have just said the person next you has green eyes because they’re all next to someone, yet they know the person next to them has green eyes

  • lilnerd5000
    lilnerd5000 15 дней назад

    So a mad dictator lets everyone go because thay have green eyes...

  • explodeing minecart Gonzales
    explodeing minecart Gonzales 15 дней назад

    I would have said "The person next to you has green eyes."  Simple Right?

  • kaeos
    kaeos 15 дней назад +1

    If at least 1 has green eyes and nobody leaves after the first day (from seeing all the other green eyes), they can all infer they were the one expected to leave, therefore it only takes 2 days

  • T Hoang Yen Pham
    T Hoang Yen Pham 15 дней назад

    At least 99 of you has green eye.

  • Lhuv A
    Lhuv A 16 дней назад

    When you say common sense and then like u live with people who have green eyes, YOU HAVE GREEN EYES.

  • jagdeep mann
    jagdeep mann 16 дней назад

    I would just go up to guard anyway, bec if I have green eyes, I will be free. If I don’t, I don’t have any chance to escape at all I will forever stay there, so I might as well die now.

  • Toon Lohmann
    Toon Lohmann 17 дней назад

    If they are all perfect logicians they should the first day they are all there that all of them know that at least one person has green eyes. Because if there are three of more people the first one thinks okey I see 2 people with green eyes so they should see each other and both know that there is at least one person with green eyes so on day 100 everybody should escape regartless if you make that statement

  • The Carpet
    The Carpet 18 дней назад

    I would of said "The Other Prisoners have green eyes."

    • Prince M
      Prince M 8 дней назад

      The Carpet That doesn't help at all!

  • Fifty Stars
    Fifty Stars 18 дней назад

    U could look in each others eyes there reflective

  • Fifty Stars
    Fifty Stars 18 дней назад

    What about the island water around the island

  • Douglas Pantz
    Douglas Pantz 19 дней назад

    These Prisoners Will Probably Be Psychologists.

    • Douglas Pantz
      Douglas Pantz 19 дней назад

      This Logic Is Super Hard To Underdtand, Let Alone Everyone Get An Argeeable Algorithm.

  • Jan Dominik Franz
    Jan Dominik Franz 20 дней назад

    more efficient solution: tell them "Everyone you see has got green eyes."

  • Mayla Davis
    Mayla Davis 21 день назад

    "Everyone's eye color is opposite of red on the color wheel.."

  • Joseph Fox
    Joseph Fox 21 день назад

    Pour water on the ground.

  • Books4ever Ever
    Books4ever Ever 21 день назад

    but isn't the eyes a sort of refective surface? i mean, couldn't you see your own eye colour when you stare long enough?

  • tobey sherrin
    tobey sherrin 22 дня назад

    I'd tell them to pour out their water the next time they get it.

  • nikhil nair
    nikhil nair 22 дня назад

    what if they are color blind

  • Raycon
    Raycon 22 дня назад

    This problem is flawed because if everyone has perfect logic then all they would need to do is look at everyone's eyes and find the average that being 99% this gives you information the chance of you having green eyes is 99% as the other 99% have green eyes. Using this simple method you could leave by day 11 at least.

  • Dan The Demon
    Dan The Demon 23 дня назад

    I would say to do a symbol to everyone you see that has green eyes

  • Arthur Tan
    Arthur Tan 23 дня назад

    I'm very sure everyone amoung the 100 is that smart to know that(sarcasm)

  • Aden
    Aden 24 дня назад

    So they cant talk, but they can understand?

  • E Miner Man
    E Miner Man 24 дня назад


  • the_perpetual _dreamer
    the_perpetual _dreamer 24 дня назад

    every person will see 99 other people with green eyes. you did a pretty shabby story buildup with the non reflective surface I mean even eyes can reflect and can be deviced to reflect enough. Now if they don't communicate with each other at all they probably don't care about each other and not help each other at all which is why they would never know their own eye colour and never leave the island. if that's the case you telling them at least one of them has green eyes doesn't make a difference cuz they would need to work together to implement your hugely obvious plot. now if they did try to work together even if they can't speak they can write to each other. sigh! it's just a narration not a puzzle. Reframe your caption.🙁

  • Shadow Senpai
    Shadow Senpai 24 дня назад

    I’d be like. I either live or die, rather than say o; this island

  • Scarlett M
    Scarlett M 26 дней назад

    I would pour the water on the ground and look at the reflection

    • KNOCK- KNow Or Curious to Know
      KNOCK- KNow Or Curious to Know 25 дней назад

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  • Mezso Astra
    Mezso Astra 26 дней назад

    Is it possible to say "If you look around, all eyes you see are green"

    • KNOCK- KNow Or Curious to Know
      KNOCK- KNow Or Curious to Know 25 дней назад

      Hey checkout some more interesting riddles, personality tests and many more on my channel, you'll like them..:)

  • Paige C
    Paige C 26 дней назад

    Difficult? I figured this out in like two seconds

    • KNOCK- KNow Or Curious to Know
      KNOCK- KNow Or Curious to Know 25 дней назад

      Hey checkout some more interesting riddles, personality tests and many more on my channel, you'll like them..:)

  • Joshua Westgor
    Joshua Westgor 26 дней назад

    Where is the "Answer in 3.....2.....1....?"

    • KNOCK- KNow Or Curious to Know
      KNOCK- KNow Or Curious to Know 25 дней назад

      Hey checkout some more interesting riddles, personality tests and many more on my channel, you'll like them..:)

  • MadProductionsink
    MadProductionsink 26 дней назад

    Or they just could have pored water in a bigger pot and seen their reflection in the water :)

  • Kyan2005
    Kyan2005 27 дней назад +1

    Idk, if you say “everyone, the person next to you has green eyes”, that would work too.

  • Nadia Bhatti
    Nadia Bhatti 27 дней назад

    There might not be mirrors or reflective surfaces EXCEPT you're looking at other people's eyes so much, you'd be seeing your own reflection in their eyes

  • De_licious Lulu Lakei
    De_licious Lulu Lakei 27 дней назад

    But they mist eat and drink something right, so they could reflektere their eyes in their drink

  • Ying Yang
    Ying Yang 27 дней назад

    Ted ed:ok solve this riddle. Me:um how should I know?!

  • Maragash
    Maragash 28 дней назад

    wouldnt "atleast 99 of you have green eyes" work also?

  • Victoria Lu
    Victoria Lu 28 дней назад +1

    I would rather take my chance and see if I have green eyes. I'd rather get tossed in the volcano than live my life like this

  • Pieter-Bas Peppelenbosch
    Pieter-Bas Peppelenbosch 28 дней назад

    They could also look in eachother eyes and have a reflection but who am i to judge

  • Philip Crawford
    Philip Crawford 28 дней назад

    I would just like pop my eye out smh

  • Xleep
    Xleep 28 дней назад

    If all the prisoners knew what your conditions on your statement were, you would have saved them an extra day. Just a random comment.

  • CG FunDip
    CG FunDip 28 дней назад

    If they were all born to people with green eyes, isn't it impossible to not have green eyes?

  • Russell Olsen
    Russell Olsen 28 дней назад

    I would say, at least fifty of you have green eyes.

  • The Spot
    The Spot 29 дней назад

    Y not just spill water on the floor and look at ur refpectoin

  • Panic! At the Green Fallout Chemical Piløts

    my statement would be "describe one thing everyone has in common except you" but i guess that maybe pushing it too far

  • obaid ullah
    obaid ullah 29 дней назад

    Just tell them you all have green eyes

  • Jennifer Valerina
    Jennifer Valerina 29 дней назад

    The prisoners can use secret passwords

  • Packi Kittipob
    Packi Kittipob 29 дней назад

    0:42 well you didn't say you're allowed to spill water on the floor

    • Packi Kittipob
      Packi Kittipob 29 дней назад

      1:44 but isn't it 101st morning

  • reading aecheych
    reading aecheych 29 дней назад

    Also, she could've just said, "Everyone of you has green eyes." I mean, the dictator could be mad at her, but at least she saved the prisoners.

  • reading aecheych
    reading aecheych 29 дней назад

    The dictator smokes weeds.

  • AnythingAtAll
    AnythingAtAll Месяц назад

    What if you look in their eyes and see your own reflection I don't know lmao.

  • Dakyz Howard
    Dakyz Howard Месяц назад

    The thing I noticed was they could spill the water and see a reflection of them self's 😎

  • MrYetiMan
    MrYetiMan Месяц назад +1

    I'm watching this for the story tbh

  • Squ4sh
    Squ4sh Месяц назад

    If the prisoners did not learn any new information, then couldn’t they have gone through the thought process themselves? They already knew that at least one of them had green eyes, so why did telling them this suddenly make a difference so that they would escape?

  • Nicklas Martos
    Nicklas Martos Месяц назад

    This assumes the prisoners all realise that everyone else understands this...

  • Haidyn W
    Haidyn W Месяц назад

    Why can't you just say: "It's probable 100 of you have green eyes."

  • gabrielhii1995
    gabrielhii1995 Месяц назад

    Look at the comments down there just realise they didnt know the essence of this riddle. First question is already mention those prisoners wont do anything unless they have 100% absoulte certainty, so even u see all prisoners have green eyes doesn't mean u must be green eyes too, and trouble is they cant tell u whether u are green eye since communication is not allowed. Therefore the solution provided by this video is the only way that everyone 100% believe themselves are green eyes.

  • Atomic Fart
    Atomic Fart Месяц назад

    Yahoo know dat none of these puzzles ever hv legitimate answers righ'

  • vaishnavi shrivastava
    vaishnavi shrivastava Месяц назад

    can't we say all of u have green eyes -_-

  • IonKattTMCE
    IonKattTMCE Месяц назад

    If you said 99 have green eyes no one would leave because everyone would see all other 99 people with green eyes and assume they are the 1 that doesnt.

  • Your Father
    Your Father Месяц назад

    You could say, 'everyone of you sees 99 other people with green eyes'.

  • CL Ng
    CL Ng Месяц назад

    What about saying "you can see that everyone else's eyes are green"?

  • Henry T
    Henry T Месяц назад

    I would say 99 people you see have green eyes

  • Landdolphin Gaming
    Landdolphin Gaming Месяц назад

    Everyone could just use sign language as only their mouths are shut

  • Hua En
    Hua En Месяц назад

    Why don't you just say "99 other prisoners have green eyes"?

  • FireFlix
    FireFlix Месяц назад

    I'd just use sign language or hand gestures

  • thorcuntdestroyess
    thorcuntdestroyess Месяц назад

    lol this is the easy version of the riddle; i remember when i did this a few years ago, there were also 100 brown eyed people and you had to figure out how many people leave the island and when. this gave you the answer and just asks for the explanation why

  • Danny SJ
    Danny SJ Месяц назад

    I'd just say "YOU CAN ALL GO"

    AUMAN Месяц назад

    What if we add one more condition: none of the prisoners know the colour green? They don't know what they are seeing is indeed green, or maybe it's orange.

  • Rödvalen
    Rödvalen Месяц назад

    You can just spill the water!

  • DancingCheese
    DancingCheese Месяц назад

    I'd just yell "You all have green eyes you fools" and just ran off

  • Daniele Trucco
    Daniele Trucco Месяц назад

    Il paradosso dell'impiccato musicato.

  • Andy
    Andy Месяц назад

    Sorry but the logic used only works for up to 4 people with green eyes.
    The solution to this puzzle is actually much simpler and does not tie your brain in knots.

    If only one person had green eyes then they would only see blue eyed people and would know they had green eyes and could leave on day one. Everyone else sees one person with green eyes who leaves on day one.
    If two people had green eyes then each of them would each see one other with green eyes and if they were still there on day two then they would know that they themselves must also have green eyes and could leave on day two. Everyone else would see two people with green eyes who leave together on day two.
    If 3 people have green eyes then each person sees either two or three others with green eyes etc. If it's day three and you can only see two people with green eyes and they didn't leave on day two then there must be a third green eyed person ie you, and you can all leave together that day.

    So each person knows that if they count the number of people they can see with green eyes and add 1 (In this case 99 + 1 =100) then on that number day (day 100) if the green eyed people are still there, then they must also have green eyes and can leave with them that day.
    This logic works for any number of people.

  • yes probably
    yes probably Месяц назад

    Eyes are reflective lol

  • Patrick's World
    Patrick's World Месяц назад

    Bruh. If the other 99 people on the island have green eyes, I would immediately think I do too.

  • Gautam Gopinathan
    Gautam Gopinathan Месяц назад

    Bah, just spill the water and look at it..

  • s gg
    s gg Месяц назад


  • Adria Merrill
    Adria Merrill Месяц назад

    Adria's my name

  • viral world
    viral world Месяц назад

    just say "the person who can see has green eyes"

  • Yang Chen
    Yang Chen Месяц назад

    If I make the statement "there is at least one person has other color (not green) eyes", is it possible that no one dare not ask the dictator to leave this island?

  • Taru Bansal
    Taru Bansal Месяц назад

    you could have just said- " all of you have the same eye colour"
    this would have saved the 100 days

  • Vector710
    Vector710 Месяц назад

    "The person next to each of you has green eyes"