Can you solve the egg drop riddle? - Yossi Elran

  • Опубликовано: 7 ноя 2017
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    The city has just opened its one-of-a-kind Faberge Egg Museum, with a single egg displayed on each floor of a 100-story building -- and the world’s most notorious jewel thief already has her eyes on the prize. Can you help the thief formulate a plan that will drop the most expensive egg she can get safely into her waiting truck? Yossi Elran shows how.
    Lesson by Yossi Elran, directed by Artrake Studio.
    Thank you so much to our patrons for your support! Without you this video would not be possible!
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Комментарии • 4 860

  • TED-Ed
    TED-Ed  Год назад +571

    Thank you so much to everyone who has supported our nonprofit mission on Patreon! You make this work possible. Want to learn more about how you can get involved? Check out our Patreon page:

    • The Shipmaster
      The Shipmaster Месяц назад

      Idk why but your outro reminded me of Aperture Science from portal

    • Movie Miniac
      Movie Miniac 3 месяца назад

      This trick can be pulled off using only 7 egg drops
      For an example
      First at 50 and if it breaks the next at 25 then if it breaks at 13 and if it survives at 19 then if it still survives at 23 if breaks then at 21 and if survives at 22. This can be applied for all circumstances. The logic is like Binary Search.

    • Doctor Shark
      Doctor Shark 4 месяца назад

      There is another way to solve this first by a 1000 foot rope to repel on next go to the top floor and take the egg and repel down

    • hannah H-M
      hannah H-M 4 месяца назад

      TED-Ed every 10 floor Interval if you checked every second floor it would still work the same first. Would it not? (Please correct me if I'm wrong) making the most 14

    • Sarah Abramova
      Sarah Abramova 5 месяцев назад

      Why are you teaching us how to steal?

  • DCYL i am
    DCYL i am 16 часов назад

    So What if we have 3 eggs or more ? What is the formula ?

  • Guy Normal
    Guy Normal 2 дня назад

    Why ">=100"

  • Gman193 Blair
    Gman193 Blair 2 дня назад


  • ChiLatina
    ChiLatina 2 дня назад

    This is too much for a 4th grader

  • Animesh Kumar
    Animesh Kumar 3 дня назад

    it helped me in doing a competitive question on codechef!

  • Kai Xu
    Kai Xu 4 дня назад

    it can take less tries than that because drooping it at the middle can narrow down the chances to half for if it brakes it'll be 0-50 and if it doesn't than it'll be 50-100

  • Jerry
    Jerry 4 дня назад


  • Bashkov B
    Bashkov B 4 дня назад

    I'm enjoying these videos but they're not riddles, they're maths problems.

  • Ryan Whitehead
    Ryan Whitehead 5 дней назад

    Couldn't you do it in less than ten? Start at flour 50, If it breaks go to floor 25, if it does not go to floor 75. lets say it does and you go to floor 25, now if it breaks go to floor 12 or 13 and if it doesn't go to floor 37 or 38. By doing this you can get it in less than ten. Am I wrong here? I am really confusing myself but I think this would work.

  • pearl nuri
    pearl nuri 5 дней назад

    I'll throw it from first and sell it at the price of one at the 100th floor .

  • Jade The Pirate Fox
    Jade The Pirate Fox 6 дней назад

    Or cover the egg in something that'll absorb the impact of the fall

  • DoctorCa
    DoctorCa 6 дней назад

    This is explaining my method for finding missing brackets in scrips

  • Saayesha Isthebest
    Saayesha Isthebest 8 дней назад

    Eggs are delicate and can break even from the 1st floor


  • SassyLlama Boi
    SassyLlama Boi 9 дней назад

    Why is the egg more valuable if they are the same!? >:/ If its the same shape, size, and weight, how is one rarer than the other?

  • Biswajit
    Biswajit 9 дней назад

    I can solve it with less than 9 steps....
    First check at half 50
    If breaks....then go for 25
    Else 75
    If egg fails at 25....
    Check at 12..
    Or else 36...
    Like this go..on...
    And I found out more less than prescribed

  • Yugi1Noob
    Yugi1Noob 10 дней назад +1

    A better solution would be using binary search:
    Start from floor 50, right in the middle of the building. If the egg breaks, go to the middle floor of the previous 50 remaining floors (25F), however, if the egg survives, go to the middle one of the following 50 floors (75F) and so on.
    It would take about 6-7 throws in the worst scenario to know in which floor will most likely the egg survive the drop.

  • Mark Buckley
    Mark Buckley 11 дней назад

    But if you drop at floor 14 and egg 1 breaks and then you do floor 13 and egg 2 breaks you have no eggs left to do the other test or idea of which floor you could go from?

  • Jyoti Shukla
    Jyoti Shukla 13 дней назад

    The real question is.....


  • Jyoti Shukla
    Jyoti Shukla 13 дней назад

    Just replace the 100 story egg with the souvenir egg indiana Jones style

  • Freddie Coile
    Freddie Coile 13 дней назад

    I got a better idea, slide down the rope with the most valuable egg.

  • Kendra Moore
    Kendra Moore 14 дней назад

    Just slide down WITH the egg

  • What Went Wrong?
    What Went Wrong? 15 дней назад

    Wait what about the diamond?

  • Unicorns and dolphins Forever
    Unicorns and dolphins Forever 16 дней назад

    8f there eggs won’t they break if you drop it from the first floor?

  • Sean Bichler
    Sean Bichler 22 дня назад

    it's possible to always do it with a maximum of 10 drops

  • Huck Wheatley
    Huck Wheatley 23 дня назад

    I may have used one of these to make breakfast

  • fremsoft
    fremsoft 23 дня назад

    Why do not uses binary search? Maximum 8 try

  • Marty Mcmarty
    Marty Mcmarty 25 дней назад +2

    2 huge problems here.
    Number 1 dropping an EGG consecutively and from increasing heights will damage it. So unless you get a different egg each time, it’s an inaccurate test.
    Number 2, how does the security guard miss an egg falling out of a window. When they said ‘the least number’ I thought we had 2 maybe 5 try’s but 14? There is no way that guard will miss 14 eggs falling out of a window unless he’s Ray Charles.

  • Indrajeet Batham
    Indrajeet Batham 25 дней назад

    I think can get the right floor in 6 eggs max..😐

  • Rajath t Ullal
    Rajath t Ullal 27 дней назад +1

    I can solve it by dropping only 6 to 7 eggs at most. By dropping egg at exactly half for ex:- first drop at 50 then if it is lower 25 then if it is higher 38 ,..... you will get it

  • Helen Zhou
    Helen Zhou 29 дней назад +1

    NARRATOR: "By dropping it out the window into her waiting cargo truck..."
    ME: The eggs will break anyways
    I mean egg

  • EpicPlays999
    EpicPlays999 29 дней назад +1

    1. Call the police.
    2. The person is arrested.

  • therealthanos S
    therealthanos S 29 дней назад +1

    the problem is actually a good one. but the story has flaws. like for ex. you can just repel down with the egg. lol

  • 100 subscribers with no Videos
    100 subscribers with no Videos Месяц назад

    These are sooooooooooooooo addicting

  • Morgan Naing
    Morgan Naing Месяц назад

    These riddles are good but you always confuse us with the way you phrase the questions and make them look harder than they actually are. This one is super easy if you didn't say throwing off too many times will draw guard's attention. WHAT THE HECk is "too many"?

  • random yt
    random yt Месяц назад +1

    How about just reppeling down with the egg?

  • Zapptor
    Zapptor Месяц назад

    my first riddle done from TED ed :O

  • Hanin Ahmed
    Hanin Ahmed Месяц назад

    why would i ever want to be or help a thief steal a valuable egg

  • Michigan League
    Michigan League Месяц назад

    eggs wear out dont they?

  • Nicodemus Bologna
    Nicodemus Bologna Месяц назад

    "Too many throws alert the guards"
    /me "it must be around max 4 throws"
    *one hour later*
    /me "it must be a best case scenario, split in area like a array sort"
    /solution lets throw it dozen of time
    /me throws the pc out of the window, it breaks at first try

  • famerex
    famerex Месяц назад

    why she have to drop the egg she can carry the egg with her going down with the rope from the building 😥😥😥😥😥

  • ForwardJumper 10
    ForwardJumper 10 Месяц назад +1

    Wait a minute... Why am I helping a thief?

  • Bethanie Low
    Bethanie Low Месяц назад +1

    why eggs?

  • I play black ops
    I play black ops Месяц назад +1

    "Throwing too many eggs will atract the guards attention"
    Says the guy who threw 14 eggs.

  • 김소희
    김소희 Месяц назад

    I found it

  • nobby plug
    nobby plug Месяц назад

    Okay i am struggling, what if you just start at 50 and then divide it by 2 depending on if it brakes of if it stays intact. So if it brakes you go to floor 25, just radom saying it stays you go to room 37, it stays so you go to room 43, it brakes. Now you have 6 more flores left. So basically you will have about 10 throws before you can steal the egg. Am i right?

    • nobby plug
      nobby plug Месяц назад

      Nevermind you have 2 eggs

  • Jim Raynor
    Jim Raynor Месяц назад

    or just put a matress in the truck and take the 100th...

  • Samy EN
    Samy EN Месяц назад

    Why Chuck the egg out why not carry it in a bag?

  • pandalover529
    pandalover529 Месяц назад

    Rules:You can't use any other method to determine the sturdiness of the eggs.
    Me: Oh, really? Good you said that, I was about to start throwing myself out the window!

  • 09LEONCraft Gamerz
    09LEONCraft Gamerz Месяц назад

    Well all of this is pointless. You see, the thief can just slide down the rope with the egg on her hand, thus making all the math pointless.(please don't take this seriously)

  • Sy
    Sy Месяц назад

    If(after 9th drop on floor 91 && no break){
    answer = only 13 drops needed
    14 drops needed

  • Finster's Light
    Finster's Light Месяц назад

    Scam School already did this one a long time ago. They used use dragon eggs instead of Faberge eggs

  • Chudong Wei
    Chudong Wei Месяц назад

    Wouldn't it be more efficient if we start at the 50th, if it breaks, moves to 25th; if it doesn't, moves to 75th, and keep going?

    • Chudong Wei
      Chudong Wei Месяц назад

      I that way, it requires less than ten drops

  • Blaze StormHammer
    Blaze StormHammer Месяц назад +1

    I swear if one of these riddles end up being on the math section of the SAT...

  • Ugonnna Gbemudu
    Ugonnna Gbemudu Месяц назад

    The highest floor which an egg will survive a drop out the window if were are being realistic is floor zero

    DJ DONUT Месяц назад


  • 89BookGirl
    89BookGirl Месяц назад

    solution: repel down with the egg
    problem solved

  • Lėja G.
    Lėja G. Месяц назад +1

    Or, you could just put pillows in the truck

  • Eriife's Korner
    Eriife's Korner Месяц назад

    Calling it a riddle really got my hopes up

  • Felix Roux
    Felix Roux Месяц назад

    'lessons worth sharing'...

    yeah, apparently learning how to be a robber is definitely worth sharing...

  • Black Mamba
    Black Mamba Месяц назад

    You can do this or you can bring a wingsuit

  • Tami Cohen
    Tami Cohen Месяц назад +1

    Just repel down while holding the most expensive egg

  • Jerome Karam
    Jerome Karam Месяц назад

    Solve this: waste of time

  • Drssdragon Ss
    Drssdragon Ss Месяц назад

    More like
    'Can you help me with the egg drop riddle?'

  • Kirito Kazuto
    Kirito Kazuto Месяц назад

    Yeah sure throw the most valuable egg you can get without breaking it, but what makes you think that the egg won't have cracks that make it less valuable?

  • isabee
    isabee Месяц назад

    The world's best jewel thief would have a less crude way to steal an egg.

  • NX14
    NX14 Месяц назад

    What if the replica is made of rubber and the other shell

  • Medhansh Verma
    Medhansh Verma Месяц назад

    Can't she take the egg in one hand and propel down with it?


  • damian harmon
    damian harmon Месяц назад

    Why are you helping a robber?

  • David Sečkář
    David Sečkář Месяц назад

    Why not use bisection? Throw first in 50th floor, if destroyed then in 25th floor, if not destroyed then 37 floor and so on.. it would take less tries than 14.

  • Tyroxinas -
    Tyroxinas - Месяц назад

    Idk, can I?

  • Falcon
    Falcon Месяц назад

    Why doesn’t The thief just take the priceless egg.
    Bring it to a much lower floor,
    And drive off with an extra egg
    (The one she got)

  • Fatih Sarıarslan
    Fatih Sarıarslan Месяц назад

    I would try 50.floor. if it crack, then 25.floor... you can find the right floor about 7 wasted eggs.

  • Davide Dave
    Davide Dave Месяц назад +1

    To me there's a better answer, wich implies her to only drop the fake eggs 7 times. You only have to start at floor 50 and if the egg breaks you then drop it from the 25th floor, else you drop it from the 75th floor. By doing this, with only 2 drops you now have a range of just 25 floors.
    You then keep going, here's an example that works in any scenario:
    Suppose the egg didn't break at floor 50, you then drop it at floor 75.
    At floor 75 it breaks, so now you want to drop it from floor 62.
    At floor 62 the egg broke, so your range is now from 50 to 62, 12 floors (discovered with only 3 drops).
    You now try dropping it at floor 56 and (suppose) it didn't break so your range is from floor 56 to 62.
    You then drop the egg from floor 59 and you are left with only 3 floors to test.
    Suppose it didn't break at floor 59 so you try at floor 61 and lastly you want to try either from floor 60 or 62 depending on if the egg broke at floor 61.
    So here's how much trys it takes, just 7. You have to keep dividing by 2 the numbers of floors you have to test..
    100 floors?
    1° drop -> your range is now just 50 floors
    2° drop -> 25 floors range
    3° drop -> 12/13 floors range (depending on the result)
    4° drop -> 6 floors range
    5° drop -> 3 floors
    6° drop -> 2 floors
    7° drop -> last drop, you now know your answer

  • Master Thg
    Master Thg Месяц назад

    Go to floor 100 and attach a parachute to the egg

  • Herr Jemeneh
    Herr Jemeneh Месяц назад

    why would you even start at 14? Just start at 60 or sth...

  • Aaron
    Aaron Месяц назад +1

    But won't the egg become weaker after each drop because it has been dropped so many times?

  • Cyber Nova
    Cyber Nova Месяц назад

    This is not a solution

    Here's why:

    if you drop it several times,the Egg will Weaken.Therefore causing it To break easier

    for example:

    if your fighting a boss in a Game and you do 50 damage But he has 100 health.So if you hit Him
    he will have 50 health but if you hit him now he dies because you weakened him to point to where he will die easily

  • Laura Kilner
    Laura Kilner Месяц назад

    Wait.. aren't theives bad guys? Don't you NOT want them to win? TED-ED EXPLAIN!!!

  • hema marchande
    hema marchande Месяц назад

    just throw the egg in deep water

  • Sandra Mody
    Sandra Mody Месяц назад


  • TallDarius12
    TallDarius12 Месяц назад

    i think this video is sponsored by HowToBasic

  • Jack
    Jack Месяц назад

    i used only seven throws

  • rithvik rithvik
    rithvik rithvik Месяц назад +1

    In my home it broke when it fell from 1 meter hight

  • Not so MLG Person
    Not so MLG Person Месяц назад +3

    You can have infinite tries if you knock out the guards by dropping the eggs on them.

  • Awkward Ainsley
    Awkward Ainsley Месяц назад

    Wouldn’t just be easier to test the 100th floor?

  • google name
    google name 2 месяца назад

    Throw it once get the of the guards

  • Cade Ragan
    Cade Ragan 2 месяца назад

    im gonna say it.

    she thicc.

  • SakurakoO.O
    SakurakoO.O 2 месяца назад

    This is cool and all but what's up with her hair?

  • Life Theorist
    Life Theorist 2 месяца назад

    Wouldn’t the shells get weaker the more you toss try to crack them?

  • Lollylollylolz
    Lollylollylolz 2 месяца назад

    What if the egg breaks on floor 1?

  • Moonlark Aesthetic
    Moonlark Aesthetic 2 месяца назад

    why are we helping a someone rob again?

  • Nafisa Sardar
    Nafisa Sardar 2 месяца назад

    i think if we start off from the mid floor and try dropping it , if it breaks then our desired floor is below if it does not then it is above
    again we can divide the number of floors left below or above by 2 and drop it from that floor , if we repeat this process we can get our desired floor with lesser number of tries than 14 😊😊

  • Bidmartinlo
    Bidmartinlo 2 месяца назад

    Well, in this case I think less math and more intuition is in order. Since you obviously want the crime to be worth it. So you start off in the middle and then take big jumps. If the egg breaks at floor 50 and 30, for example; then it's probably not worth it. If it doesn't break at floor 50, but at 70; then maybe try one more time at 60. After all, it's less risky.

  • sujan koilakuntla
    sujan koilakuntla 2 месяца назад

    My eggs always break, even if they fall from my hands onto the ground

  • Nicolas Thompson
    Nicolas Thompson 2 месяца назад

    I’d think that dropping at 50 then either 75 or 25 depending on if it broke because your eliminating 75 percent of the choices in 2 drops eg 1st drop at 50 doesn’t break then 2nd drop at 75 breaks 3rd drop 66 it breaks 4th drop 54 it doesn’t break 5th drop 60 it doesn’t break 6th drop 63 it breaks 7th 61 it doesn’t break 8th drop 62 it breaks making 61 the max height in 8 drops

  • Ann Allen
    Ann Allen 2 месяца назад

    "Heh, now I know how to take the beutiful... EGG WIGH GALD INSUDE UT!" YEAH!

  • KapperKatMapping
    KapperKatMapping 2 месяца назад

    I put cushions at the bottom so id say 0 tries and just drop it at 100

  • Reason Peason
    Reason Peason 2 месяца назад

    It wasn’t in the rules you could drop the surviving egg more than once which is a major element of the answer. Like not even a hint in the listed rules which is kind of standard in these but especially pointing our security being suspicious of too many drops seemed to imply one drop per egg.
    Of course if she stole a fannypack from the gift shop instead this wouldn’t be a problem

  • Son of God 333
    Son of God 333 2 месяца назад

    Why dont hug the egg while roping down