Topic:

Blue eyes.

Results 1 to 9 of 9

  1. TDU 505 is offline Clinically Insane
    Location: Singapore
    Posts: 2,754

    #1

    Default Blue eyes.

    "A group of people with assorted eye colors live on an island. They are all perfect logicians -- if a conclusion can be logically deduced, they will do it instantly. No one knows the color of their eyes. Every night at midnight, a ferry stops at the island. If anyone has figured out the color of their own eyes, they [must] leave the island that midnight. Everyone can see everyone else at all times and keeps a count of the number of people they see with each eye color (excluding themselves), but they cannot otherwise communicate. Everyone on the island knows all the rules in this paragraph.

    On this island there are 100 blue-eyed people, 100 brown-eyed people, and the Guru (she happens to have green eyes). So any given blue-eyed person can see 100 people with brown eyes and 99 people with blue eyes (and one with green), but that does not tell him his own eye color; as far as he knows the totals could be 101 brown and 99 blue. Or 100 brown, 99 blue, and he could have red eyes.

    The Guru is allowed to speak once (let's say at noon), on one day in all their endless years on the island. Standing before the islanders, she says the following:

    "I can see someone who has blue eyes."

    Who leaves the island, and on what night?


    There are no mirrors or reflecting surfaces, nothing dumb. It is not a trick question, and the answer is logical. It doesn't depend on tricky wording or anyone lying or guessing, and it doesn't involve people doing something silly like creating a sign language or doing genetics. The Guru is not making eye contact with anyone in particular; she's simply saying "I count at least one blue-eyed person on this island who isn't me."

    And lastly, the answer is not "no one leaves."

    Hehhehheh good luck with this one


  2. RB26DETT is offline Banned
    Location: Manila, Philippines
    Posts: 5,389

    #2

    Default

    my head just hurt. >.<

  3. Camel is offline Legendary Classic
      
    Posts: 11,510

    #3

    Default

    Quote Originally Posted by RB26DETT »
    my head just hurt. >.<
    I'm with you, brain cramps

  4. Speedtouch is offline I Wish I Was Special.
    Location: England
    Posts: 1,402

    #4

    Default

    I'm getting somewhere... Its called google.

    Last edited by Speedtouch; 24/07/08 at 13:31 PM.

    PhOTW Week 8 + 15 | PTOTW Week 1, 4 + 5

  5. Car Freak is offline loves dirt too
    Location: Singapore
    Posts: 3,066

    #5

    Default

    You had to post this up right when I'm in the middle of my history essay...


    Quote Originally Posted by Jon
    You're impossible, Mark
    Quote Originally Posted by Mark
    Impossible is nothing. Therefore I am nothing...

  6. hesonly5 is offline Hungry Hungry Hippos! :D
     
    Location: UK
    Posts: 2,983

    #6

    Default

    Confused.

  7. RB26DETT is offline Banned
    Location: Manila, Philippines
    Posts: 5,389

    #7

    Default

    as always.

  8. hesonly5 is offline Hungry Hungry Hippos! :D
     
    Location: UK
    Posts: 2,983

    #8

    Default

    What?

  9. RB26DETT is offline Banned
    Location: Manila, Philippines
    Posts: 5,389

    #9

    Default

    nothing.


 

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