Can you solve the seven planets riddle? – Edwin F. Meyer

Can you solve the seven planets riddle? – Edwin F. Meyer

22 views
0



Practice more problem-solving at https://brilliant.org/TedEd/
Solution to the bonus riddle mentioned at the end: https://brilliant.org/TedEdTitanic/

Your interstellar police squad has tracked a group of criminals to a cluster of seven planets. Now you must apprehend them before their reinforcements arrive. Of course, the fugitives won’t just stay put – they’ll try to dodge you by moving from planet to planet. Can you devise a sequence for searching the planets that’s guaranteed to catch them in ten warps or less? Edwin F. Meyer shows how.

Lesson by Edwin F. Meyer, animation by TED-Ed.

Thank you so much to our patrons for your support! Without you this video would not be possible! Penelope Misquitta, Ravi S. Rāmphal, Emma Moyse, Fahad Nasser Chowdhury, Marin Kovachev, Roman Pinchuk, Mohamad Aiman Fitri Bin Annuar, Daniel Huerga, Maria Lerchbaumer, Kevin Le, Edgar Campos Barrachina, Dianne Palomar, Chris Buccellati, Curtis Light, Ernest Chow, Liana Switzer, Maija Chapman, Pamela Harrison, Dylan Drover, Mighterbump , Beatriz Inácio, Robert Hargis, Soma Ali, Mark wisdom, Mircea Sîrbu, Ai Ejima, Molly Gardner, Irindany Sandoval, William Bravante, Elizabeth Parker, Sai Krishna Koyoda, Therapist Gus, Samuel Barbas, Betsy Feathers, Maxwell Ingram, Ajinkya Deshmukh, and Victoria Soler-Roig.

source

Comments
  • TED-Ed1

    January 21, 2019

    If you want to practice more problem-solving for free, head to https://brilliant.org/TedEd/. If you want to signup for a "premium" account, hurry! The first 833 of you to visit that link will receive 20% off the annual premium subscription. Thanks to Brilliant for supporting this video!

    Reply
  • Tyler Brown2

    January 21, 2019

    Throw water on the river and walk where there is no fire and go around the river till its short enogh to cross and shallow enogh to see the bottom so they can see the cricadiles

    Reply
  • Hunter XD3

    January 21, 2019

    It did not leave me straight to the answer

    Reply
  • Ënguienne Ohmegabarre4

    January 21, 2019

    Galactic Police Force which responsable of keeping peace for the entire galaxy
    Has 2 employees

    Reply
  • James Song5

    January 21, 2019

    Stat wars planets Rip offs hahah

    Reply
  • Ashley Playz6

    January 21, 2019

    Harry is harry potter

    Reply
  • JORJE19087

    January 21, 2019

    There is another way to interpret the riddle. That is from planet 3 the robbers can be 1 or 2 steps away from you or on planet 3. So you start on planet 3, if you do not catch them it mean they are 1 or 2 steps away. You go again at planet 3 no they are either 2 steps away or you catch them. So you know at the next move they will be 1 step away. You check 1 of the planets 1 step away and either you find them or not. Then you go to planet 3 again, either you catch them or they are 2 steps away, so again on the next step they will be 1 step away, now you search at t1 of the other planets 1 step away from 3 and either you catch them or not. if you do not catch them then at the next step you go again at 3 and either you catch them or they are two steps away, so for last move you go to the planet 1 step away left. So a sequence that would guarantee to catch them is 3-3-6-3-2-3-4

    Reply
  • threej4pope8

    January 21, 2019

    Assuming Harry and Ron are perfect logicians, Harry has watched it 4 times, Ron 3. Here's the steps:

    A). Harry asks Ron if he's seen it more. This shows the score isn't H1, R2, because if it were, Harry would realize since he's only seen it once, Ron would have had to see it twice, and wouldn't have texted Ron to ask. Therefore, Harry has seen it at least twice.

    B) Ron says he doesn't know. This shows the score isn't H2, R1, because if it were, Ron would realize since he's only seen it once, Harry would have had to see it twice. Therefore, Ron has to have seen it twice.

    C) Ron also know, that because Harry asked in the first place, Harry also must have seen it at least twice (see A). If Ron had seen it exactly twice, that means Harry has watched it three times, and Ron would know the answer. Because he didn't, this means Ron has seen it at least 3 times.

    D) Because (B) and (C), Harry knows Ron has seen it at least 3 times. But he still doesn't know if he's seen it more or not. This means he's seen it more than twice (because he'd know that he'd seen it twice so ron saw it 3 times), and he's seen it more than three times (because he'd know if he saw it three times, then ron had watched it 4 times). Because Harry doesn't know, he's seen it at least 4 times.

    E) Now Ron knows! Because Harry has seen it at least 4 times, and he knows he himself only saw it 3 times, we have a match. Harry 4, Ron 3.

    Reply
  • Shubham Goel9

    January 21, 2019

    They should wait on a particular planet and wait for 7turns to let them come on their own

    Reply
  • Rudrarup Roy10

    January 21, 2019

    Bonus Riddle Answer please!

    Reply
  • Chun Wah Cheung11

    January 21, 2019

    How about sending 7 cars lol

    Reply
  • r33b the hypnotoad12

    January 21, 2019

    Tattooide, Dagovah…
    they sound familiar…
    0:21 btw

    Reply
  • Cristi Bordei13

    January 21, 2019

    For the bonus riddle: Ron hasn't watched titanic once in his life, so probably harry watched it once. I know, i am a GENIUS

    Reply
  • Musiclly watsapp fun14

    January 21, 2019

    The planet names are taken from star wars

    Reply
  • Rob Land15

    January 21, 2019

    Unforchanently you were working for the empire and you just arrested Han Luke and leia

    Reply
  • Matthew Smith16

    January 21, 2019

    Hermione looks so smug sending that text!

    Reply
  • Sophie Price17

    January 21, 2019

    2:18 only Star Wars fans will get

    Reply
  • bar11bar18

    January 21, 2019

    But they can still scape, if they start at planet number 1 or 3 and just follow the steps the cops do they can scape

    Reply
  • Monkey man19

    January 21, 2019

    These are the star wars planets with changed names!

    1. Endor
    2.yavin 4
    3. Bespin
    4. Tatooine
    5. Dagobah
    6. Aldeeran
    7. Kashyyk

    Reply
  • Sprazzic20

    January 21, 2019

    What? Doesn’t that require you to be able to rush to a planet before the rebels can move away? Surely if the rebels are on planet 2, and you then go to planet two, they could have moved to planet one and the solution wouldn’t work? You then move to three, but while you were on your way there surely they could go back to another planet? Ehh, I feel like this one wasnt explained very well.

    Reply

Your email address will not be published. Required fields are marked *