HomeОбразованиеRelated VideosMore From: TED-Ed

Can you solve the prisoner hat riddle? - Alex Gendler

132170 ratings | 12712773 views
View full lesson: http://ed.ted.com/lessons/can-you-solve-the-prisoner-hat-riddle-alex-gendler Want more? Try the buried treasure riddle: https://www.youtube.com/watch?v=tCeklW2e6_E You and nine other individuals have been captured by super-intelligent alien overlords. The aliens think humans look quite tasty, but their civilization forbids eating highly logical and cooperative beings. Unfortunately, they’re not sure whether you qualify, so they decide to give you all a test. Can you solve this hat riddle? Alex Gendler shows how. Lesson by Alex Gendler, animation by Artrake Studio.
Html code for embedding videos on your blog
Text Comments (13048)
NX14 (18 minutes ago)
Aw man.....why do i have to be the midget
Bad Vibes (10 hours ago)
Just eat me
Ralasuco Gaming (11 hours ago)
Poor cow
Jessica_15 ^w^ (16 hours ago)
Plot twist, the last dude screwed up hahahahahahahaahh
Devin Haaser (1 day ago)
An easier answer would be must saying the color of hat that is immediately in front of you, then you'd get 9 right and the 10th person would have a 50% chance of getting his hat right.
Devin Haaser (1 day ago)
+Gunblade44 Yes, and that would be the only hat that you would miss... And you're allowed to miss one.
Gunblade44 (1 day ago)
No, because if the person in front of you had a different color hat than you, then you would get your own hat wrong.
Peter Poulos (1 day ago)
This strategy assumes people won't make mistakes. An easier strat would be for the first person to say the color of the most number of hats. If he gets it wrong, that's fine, everyone else can say the same color.
rAndom facTs (1 day ago)
a points missed here : They are allowed to work out a strategy prior to lining up.
Niidea1986 (2 days ago)
Plot twist, I am potentially depressive person who may or may not think this is the right moment to commit suicide. Sorry crew.
Jonathan Schuett (2 days ago)
So... Did anyone else realize that you could just... Take the hat you're wearing off and look?
Chaymae K (3 days ago)
Ok but if you come up with a signal to tell each other what hat are you wearing wouldn't you be considered "highly intellegent" ?
alex perry (3 days ago)
"what a weird rule that feels like it was only made up for this occasion " probs the brain of one of the 10 people
Tanisha A (3 days ago)
> 🍰 ⋆ 🇨🇭🇦🇳🇬🇪EE 🇾🇴🇺🇷 𝙏𝙝𝙤𝙪𝙜𝙝𝙩𝙨, 𝘾𝙝𝙖𝙣𝙜𝙚ee 𝙔𝙤𝙪𝙧 🇨🇮🇷🇨🇺🇲🇸🇹🇦🇳🇨🇪🇸❣ (𝙇𝙖𝙬 𝙊𝙛 Attraction) 𝙋𝙤𝙬𝙚𝙧𝙛𝙪𝙡ll  🍰 ⋆ 🍰  >> >>https://t.co/iwLrU6RZzP?LvFGkgEyzGsU 1236
Moun Glow (4 days ago)
This is possible because there is an even number of people if they were odd in number it would have been more complicated...
Davide Colombo (5 days ago)
♩😳 Simple ⅋ 𝗣𝗿𝗼𝗳𝗼𝘂𝗻𝒅 𝗘𝘅𝗽𝗹𝗮𝗻𝗮𝘁𝗶𝗼𝗻 𝗼𝗻 𝗩𝗶𝗯𝗿𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗙𝗿𝗲𝗾𝘂𝗲𝗻𝗰𝗶𝗲𝒔 | 𝑳𝒂𝒘 𝗼𝗳 Attractionn ☢🎃 >>https://t.co/iwLrU6RZzP?N5vJSNXPEwA34ee
Hellen Kevin (5 days ago)
You’re not you when you’re hungry.Have a snickers.
Shaggy dude (6 days ago)
This won't work. Why? Because nobody would listen to you and they will have a really bad idea and we will all die.
Snowflake 11 (6 days ago)
I have no intention of solving the riddles, his voice is just very relaxing. 😴
Kristian Baum (7 days ago)
>> The Ɩąῳ 𝙤𝙛 Attraction 𝙖𝙣𝙙 𝙃𝙤𝙬 𝙩𝙤 𝙈𝙖𝙨𝙩𝙚𝙧rr 𝙞𝙩 ᵒᴼᵒ▫▫ᵒᴼᵒ▫▫·∙∙ >> >>https://t.co/iwLrU6RZzP?de22sanamene54 8265
iMagic Gamer (7 days ago)
Actually. The way i thought of this was like this: The one thats behind says the color of the one in front, but then i realized that the tallest one and the shortest one would be uncertain of their own hat.
yahya ali (7 days ago)
Please add Indonesia translate.
Ghost 54343 (8 days ago)
But there’s that one person that ruins everything and you all die
Alex's Customs (9 days ago)
Or you just say the color of the hat in front of you!
Gunblade44 (1 day ago)
No, because if the person in front of you had a different color hat than you, then you would get your own hat wrong.
Don Fantasy (9 days ago)
I'm dead
David Dimovski (9 days ago)
Why can't everyone just state what color is the hat of the person in front of them, starting from the tallest person? :/
David Dimovski (17 hours ago)
+Gunblade44 I'm not certain that you see my point, I'm saying that the tallest person should state the color of the person in front of them, and the next one is to immediately understand that the color the last person before them has stated is in fact the color of their own hat, and everyone should do the same - I see no problem in figuring out 9/10 hats. :) Did I explain myself well?
Gunblade44 (20 hours ago)
right, but you're going to get an answer wrong every time the person in front of you has a different hat color, so you could potentially get all of them wrong.
David Dimovski (21 hours ago)
+Gunblade44 but you're allowed to get 1 answer wrong :)
Gunblade44 (1 day ago)
No, because if the person in front of you had a different color hat than you, then you would get your own hat wrong.
Dark diven Skull (9 days ago)
If that happened I would be the tall one and forget the plan
Hopefully next time this happens someone is eating food and they give that to the aliens. My jokes are horrible :p
Seld1968 (10 days ago)
🐉♖  𝗜𝘁 🇴🇵🇪🇳🇸 your 🇲🇮🇳🇩 𝘁𝗼 𝗴𝗲𝘁 🇺🇳🇱🇮🇲🇮🇹🇪🇩 𝗮𝗯𝘂𝗻𝗱𝗮𝗻𝗰𝗲ee 𝗳𝗿𝗼𝗺 𝘁𝗵𝗲 𝗻𝗮𝘁𝘂𝗿𝗲 𝘁𝗼 𝗿𝗲𝘀𝗲𝘁 𝘆𝗼𝘂𝗿 𝗯𝗿𝗮𝗶𝗻 𝘁𝗼 𝗮𝗰𝗵𝗶𝗲𝘃𝗲 𝗹𝗶𝗺𝗶𝘁𝗹𝗲𝘀𝘀 🇩🇪🇸🇮🇷🇪🇸  👽👑 >> >> https://t.co/iwLrU6RZzP?33ddf55jansed87 6314
Julie Lee (10 days ago)
Those aren't people those r backterria and the aliens are phages
Kazuma Yoshiyuki (10 days ago)
There is another solution, which lead to the same result, if the First says what is the color of the next that he sees. evrybody will know what is the color their own hat but the first one. That work and is more easy to think that the way that is shown.
Kazuma Yoshiyuki (16 hours ago)
You are right, thanks !
Gunblade44 (1 day ago)
No, because if the person in front of you had a different color hat than you, then you would get your own hat wrong.
Darweysh (11 days ago)
well if they don't tell each other the strategy how do they know first person is talking about odd or even or only his own hat? rules say they can't signal each other. and all of them are not students of one logic classroom to understand how much intelligent is another one. the riddle is on a big chance my friend. not everyone has the same plan!!!
Gunblade44 (1 day ago)
It says at the end they can discuss a strategy and come up with a plan
Aztec_13 (11 days ago)
Poor cow😆
Amy Marie (11 days ago)
Just add ketchup to me now and get it over with.
HordeOfHeroes (11 days ago)
You could just say the colour of the person infront of you, couldn‘t you?
Happy Cloud (11 days ago)
They are eats me :(
Baij Nath (11 days ago)
What is the relation between edible and riddle ?
P.C.P (12 days ago)
Just tell them cows are more delightful than humans, buy them some steaks, man.
Zamel Saru (12 days ago)
I don't quite understand this one......
Zanny Ray (12 days ago)
What I'd they spoke different languages
Preston Smith (12 days ago)
Still didn't understand
broskie packingGun (13 days ago)
And you are a midget.
bdusa (13 days ago)
It's not stated that you could only say one color so i'd say the first prisoner pick a color for his hat and then whisper the color of the hat just infront of him then repeat the step all through out.
Kimberly Suarez (14 days ago)
Taking off your hat?
Sushi Cat :3 (14 days ago)
1:23 Idk if he/she sounds cute or very scary I choose cute for no reason XD
faroshscale (14 days ago)
Why are all the prisoners jewish?
Ashish Kumar (15 days ago)
if they can plan ,then there is a better way...every member will say the color of member next to him...it will solve the issue.
Sprazzal (15 days ago)
Hey screw you cows are more logical than most people I know
BrotherMaddness (15 days ago)
When the tallest person doesn’t know how to count
Dhara Sinhal (15 days ago)
Is this loss
Heavenly Guardian (15 days ago)
This is why I don’t go outside
Tony Zeng (15 days ago)
haha gotcha b****!
Tony Zeng (15 days ago)
haha gotcha b****!
Megan A. Odegaard (16 days ago)
🇭🇴🇼 𝙏𝙤 🇹🇷🇦🇮🇳 𝙏𝙝𝙚 𝙈𝙞𝙣𝙙 𝙏𝙤 𝘼𝙩𝙩𝙧𝙖𝙘𝙩ttt 𝙒𝙝𝙖𝙩 𝙔𝙤𝙪 𝘿𝙚𝙨𝙞𝙧𝙚! (𝙇𝙖𝙬 𝙊𝙛 𝘼𝙩𝙩𝙧𝙖𝙘𝙩𝙞𝙤nnn) (𝙉𝙚𝙬 🇺🇵🇩🇦🇹🇪)  >> >>https://t.co/iwLrU6RZzP?dede0c02danava43 1006
Why is it always the cows?! 🐄 In the movies, in TV shows, in YouTube videos, heck, even on Animal Jam! 💢 #LeaveTheCowsAlone20WhateverOrSomething
K. Mitchell (16 days ago)
𝙔𝙤𝙪 𝙉𝙚𝙚𝙙 𝙏𝙤 𝘼𝙥𝙙𝙤𝙥𝙩ttt 𝙏𝙝𝙞𝙨 𝙈𝙞𝙣𝙙𝙨𝙚𝙩𝙩 (𝘽𝙚𝙨𝙩 𝙈𝙤𝙩𝙞𝙫𝙖𝙩𝙞𝙤𝙣𝙖𝙡lll 𝙑𝙞𝙙𝙚𝙤 𝙀𝙫𝙚𝙧rrr) >>https://t.co/iwLrU6RZzP?33paspas22 8982
Kali Rahui (17 days ago)
Can’t they just look up
marshadow fan the pro (17 days ago)
Look at the guy giving you the hat or if he tell’s you close your eyes just at the tiny bity cornor of your eye to see ▪️▪️▫️▫️▪️▪️▫️▪️▫️▫️▫️▫️▪️▫️▪️
Marlene M (18 days ago)
Yeah. Or maybe the aliens - intelligent as you claim them to be - are vegans.
Absolutely Not (18 days ago)
this is genius
A Name (18 days ago)
I love these riddles even one my whole class did this in the talent show
Justin Harris (18 days ago)
You are allowed to take off your hat and look at it.
Good riddle(but solved)
Weiss Fox (19 days ago)
Couldn't you just tell the person in front of you what their hat color is so that they all know what theirs is except the one in the back? The video's explanation seems overly complicated.
Braden Robertson (18 days ago)
Kyle Stoner I thought the same thing as him but I get it now
Kyle Stoner (19 days ago)
Because you just used your guess of your own hat to tell the person in front of you what theirs is, disregarding what the person behind you said. You have to be able to deduce for yourself the color of your hat; you don't have the luxury of providing that information AND guessing your own hat in one guess. That info has to be provided by the first throwaway guess. I don't know why the actual answer isn't good enough for you? lol
P.S Its Logic (19 days ago)
Can't u just say the person in front u color and repeat till the end?
Erin Park (19 days ago)
aliens are highly intelligent but are not sure if the humans are smart enough. *cries*
Andi S (19 days ago)
I can't figure this out, I'm dead.
Donna C. Humphrey (19 days ago)
▀▄▀▄▀▄ 🅆🄷🄰🅃🄴🅅🄴🅁 𝙞𝙩 𝙞𝙨 🅈🄾🅄 𝙖𝙧𝙚 𝙛𝙚𝙚𝙡𝙞𝙣𝙜 𝙞𝙨 𝙖 𝙥𝙚𝙧𝙛𝙚𝙘𝙩 𝙧𝙚𝙛𝙡𝙚𝙘𝙩𝙞𝙤𝙣 𝙤𝙛 𝙬𝙝𝙖𝙩 𝙞𝙨 𝙞𝙣 𝙩𝙝𝙚 𝙥𝙧𝙤𝙘𝙚𝙨𝙨 𝙤𝙛 🄱🄴🄲🄾🄼🄸🄽🄶 ▄▀▄▀▄▀ . >>https://t.co/iwLrU6RZzP?76lamadelo12 1290
Talita Setyadi (19 days ago)
Can’t they just say the color of the hat of the person in front of them? Then the person at the back will be the only one with 50% chance of it being wrong ...
Caroline V (13 days ago)
Talita Setyadi no cus when it's ur turn are you gonna say your color or the color of the person in front of you
Spicey (19 days ago)
shikhar jain (19 days ago)
Why can't the taller person just tell the color of the hat of the person in front of him and likely continue the series forward By this they get 9 correct and .5 probablity for the first one.
Elias Van Drisse (20 days ago)
Little Johnny's hat would fall off and I just know it.
Luciana Justice (20 days ago)
You and 10 other people Hold up in that tiny bean person xD
Samuel Griggs (20 days ago)
Didn't this channel used to be on Netflix? A couple of years ago
Yanira Martínez (21 days ago)
Showan (21 days ago)
Just tell the person in front of you what color their hat is
Sosuke Aizen (21 days ago)
Didn't realize they could talk before the riddle
Cornifex (21 days ago)
I came up with a different solution that works aswell:The first one says the colour of the guy infront of him - ok now he knows his colour but how does he communicate the colour of the guy infront of him - solution: if you say your colour immidiatly it means the guy in front of you got the same colour aswell, if you wait a few seconds(enought for the guy in front of you gets it) he knows he has the other colour.
DA ONLE WEI (22 days ago)
1:41 if you just want the answer
Aditya Raghuwanshi (22 days ago)
There's another better and simpler solution that the previous person says the color of the hat of the next person he sees, and this way there is 50% probability that only last person give a wrong answer.
TheBrainandBrawn (22 days ago)
Caveat: no two prisoners are the same height or at least close enough that the top of a head blocks the sight of someone behind them.
Tagnar (23 days ago)
Why not just say the color of the hat of person in front of you? You will get (n-1) hats correctly. What am I missing here? Edit: Ok I get, they didn't really explain it in the video but it's given in the context. Telling the color of person in front of you can't work because you must 'guess' the color as you speak for first time, not and the end of the 'round'.
SimpleHowToVideos (23 days ago)
Why not just say the color of tge har in front?
creepybeagle (23 days ago)
3:03 *Imperial Alien guard approaches prisoner 4* STOP, YOU'VE VIOLATED THE LAW! (she looks behind her)
Imdehlarry Alexa Tully (24 days ago)
Killers the hate Read it backwards
Xxx Fire xxX (24 days ago)
The dislikes are from vegans looking at 4:14
Bim Bims (25 days ago)
but, what if in the 4th person, the alien switch again their hat randomly? lol
Hayden Dizon (25 days ago)
IQ 9000
Perish Fools (25 days ago)
Why would you be allowed 1 wrong answer if there's 2 answers
Gunblade44 (1 day ago)
There are 10 people and 10 guesses, and of those 10 guesses you can only get one wrong
Dimaz Sadewa (25 days ago)
i disliked this video because i'm the alien
Debanga Medhi (25 days ago)
Just tell the colour of hat worn by the person in front
Julian hfdssgg (26 days ago)
And why dont they just say the color of the hat in front of them... They would have a chance of 50% to get all 10 right and a 50% chance of 9.. so they would win in every situation... or is it forbitten?
Michael King (26 days ago)
got it
WonderMe Plays (26 days ago)
how do you know what the plan is
Salad Snake (27 days ago)
Shaz Demon (27 days ago)
I don't get it
MundoDemocrático (27 days ago)
what if all the hats are white?????
Gunblade44 (1 day ago)
you will still get at least 9 right if you stick with the plan even if all of them are white
When you forget to tell the others you're color blind
Ravage - Fortnite (27 days ago)
Everyone: _says their hat correctly_ Me: uh UH RED
Koalas Productions (28 days ago)
a big flying saucer but the military cant even attack them....
Underpantswher (28 days ago)
I have a strategy, run up to them and lunch their face and eat them instead.
Prince Tony (28 days ago)
However think's of these has waaaay too much time on their hands

Would you like to comment?

Join YouTube for a free account, or sign in if you are already a member.
New Ideas Into Pubg Android Version Never Before Revealed PUBG mobile version isnt a surprise. In any event, its tricky to observe how a mobile model of PUBG wont be a huge moneymaker for everybody involved. Apparently a cell version was just a great bonus thrown into that offer. Furthermore, a cell variant of the game is in development. The English version also includes the extra advantage of linking your FB account with the game The Ideal Approach for Pubg Android Version The Android version looks like slightly more generous in that respect. Contact Us The present version doesnt represent the last quality of the game, as well keep optimizing existing content and adding new capabilities.
Android was constructed from the ground-up to allow developers to create compelling mobile applications that take full benefit of the specs a handset has to offer you. PUBG Android demonstrates that the release will shortly be available in all markets in the marketplace. Even though a smartphone may not lend itself to a control scheme with pinpoint precision, the port still ought to give you an opportunity to become involved in the action. PUBG Mobile has an exceptional approach to bypassing the should collect money. Before youre able to learn ways to get PUBG Mobile on Android, theres a couple of things you will need to know more about the games soft launch first. PUBG Mobile is as challenging and a little bit more frustrating than the PC version because of the controls, but its immensely addictive and difficult to put down. Utilize PUBG Mobile cheat to acquire in-app purchases and obtain freebies in the total game without having to spend any Money. Unlike the desktop version, PUBG mobile is totally free to download, thus theres no barrier to entry if you wish to give it a try. Anyway, what you ought to know is that mobile PUBG is very fantastic. To start with, youre likely to want to understand how to download PUBG mobile, wherever youre in the world. The perfect way to take pleasure in the game is if youre a fan of Battle Royale movie or The Hunger Games. It contains numerous updates and a significant amount of skins, which means that you will be addicted in a matter of hours. It is basically a full port of the PC version of the game, which means that it does come with most of the PC versions features. The very first game which is comparable to PUBG is Rule of Survival. You dont need to fret anymore since there are a great deal of games that have similar mechanics. The game contains multiple unique stories and each story is broken up into different Ultimate Utility for PUBG. It is not unusual for new games to be published in Canada first, employing a more compact subset of the North American market for a test bed.
If you would like to take your game to another level and boost your odds for winning, you have to use free of charge now our amazing PUBG Mobile Hack on-line Cheat Tool. The game consists of a ranking system which means that its competitive. There are two PUBG games can be found play shop.