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Math Help - the next number on the sequence

  1. #1
    rcs
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    the next number on the sequence

    Find the next number in the sequence 1, 3, 8, 16, ___

    i've been using arithmetic sequence and even geometric sequence i could not get the answer because it does not have a constant difference and ratio. please do help me on this. from the book it says 27 is the next... but i could not get the pattern.
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  2. #2
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    Re: the next number on the sequence

    Find the differences between adjacent numbers and then find the differences between those differences.
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  3. #3
    rcs
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    Re: the next number on the sequence

    Quote Originally Posted by emakarov View Post
    Find the differences between adjacent numbers and then find the differences between those differences.
    3-1 = 2
    8-3 = 5 ... how is it done?
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  4. #4
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    Re: the next number on the sequence

    Quote Originally Posted by rcs View Post
    3-1 = 2
    8-3 = 5 ... how is it done?
    Yes.

    Code:
    1   3   8   16   27
      2   5   8    11
            ...
    Now fill the third row.
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  5. #5
    rcs
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    Re: the next number on the sequence

    Quote Originally Posted by emakarov View Post
    Yes.

    Code:
    1   3   8   16   27
      2   5   8    11
            ...
    Now fill the third row.
    thanks
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