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    spilbury's Avatar
    spilbury Posts: 1, Reputation: 1
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    #1

    Sep 7, 2010, 01:44 AM
    What are the next 3 numbers in the sequence 1,11,21,1211,111221
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Sep 7, 2010, 10:20 AM

    Have you tried reading the digits aloud? :)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Sep 7, 2010, 10:20 AM

    This is a classic riddle - one of my favorites. I won't give away the answer, but here's a hint - try sounding out each sequence in order, like this:

    One
    One one
    Two one
    One two one one

    And another hint -- the next term in the sequence after 111221 starts with 3.

    Good luck!
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #4

    Sep 7, 2010, 09:05 PM

    Isn't this the one we did on the riddle thread, that I couldn't figure out? And now I've forgotten already. LOL.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #5

    Sep 7, 2010, 09:46 PM

    Yes, that's the very one, and I give the same hint every time :p
    Alty's Avatar
    Alty Posts: 28,317, Reputation: 5972
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    #6

    Sep 7, 2010, 10:05 PM

    Ooh I know! I know!

    When can we tell?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #7

    Sep 7, 2010, 10:10 PM

    I'd say... until the OP posts an answer. This is, nonetheless homework :rolleyes:
    Alty's Avatar
    Alty Posts: 28,317, Reputation: 5972
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    #8

    Sep 7, 2010, 10:33 PM

    How can this be math homework? There's no mathematical way to figure this out. :confused:
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #9

    Sep 7, 2010, 10:35 PM

    Well, my first supposition was because it's under the topic homework help... =/
    Alty's Avatar
    Alty Posts: 28,317, Reputation: 5972
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    #10

    Sep 7, 2010, 10:38 PM
    Quote Originally Posted by Unknown008 View Post
    Well, my first supposition was due to the fact that it's under the topic homework help... =/
    Oh I agree, I'm just wondering why it's in Math & Science. If it's math, how could you figure it out mathematically? You can't. It's not an equation, the sequence cannot be deciphered using math.

    I'd be more inclined to put it in English homework, but then that would mean the OP has the answer to the question. ;)
    morgaine300's Avatar
    morgaine300 Posts: 6,561, Reputation: 276
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    #11

    Sep 7, 2010, 11:00 PM

    It might just be a math teacher trying to make people think a bit, or even extra credit. I could easily see a teacher doing this, yes. (But I would hope it wouldn't be for normal credit.)
    aimee_tt's Avatar
    aimee_tt Posts: 340, Reputation: 143
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    #12

    Sep 7, 2010, 11:35 PM

    I know this! Good old Google LOL
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #13

    Sep 7, 2010, 11:38 PM
    Quote Originally Posted by aimee_tt View Post
    I know this! Good old Google LOL
    You cheated! :eek:
    aimee_tt's Avatar
    aimee_tt Posts: 340, Reputation: 143
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    #14

    Sep 7, 2010, 11:45 PM

    Hehe Well not exactly I had an idea what it was.. I was wrong. But wanted to check it lol

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