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Math Help - Sequence

  1. #1
    Junior Member
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    Feb 2010
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    Sequence

    If a sequence is:

    a. -2,2,-2,2,-2,....

    b. 4,2,(4/3),1,(4/5),...

    How do I prove the common difference, d, using the Arithmetic Sequence for these 2 problems?

    ie.
    a3 = a1 (n - 1)d

    So would problem a be:

    -2 = -2(3-1)d ?
    Im getting 1/2 for d but its not the right answer

    Thanks
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  2. #2
    Banned
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    Quote Originally Posted by ugkwan View Post
    If a sequence is:

    a. -2,2,-2,2,-2,....

    b. 4,2,(4/3),1,(4/5),...

    How do I prove the common difference, d, using the Arithmetic Sequence for these 2 problems?


    You can't because none of these sequences is arithmetic: the first one is a (rather boring) geometric sequence with common ration = -1, and the second one is just a sequence...

    Tonio



    ie.
    a3 = a1 (n - 1)d

    So would problem a be:

    -2 = -2(3-1)d ?
    Im getting 1/2 for d but its not the right answer

    Thanks
    .
    Follow Math Help Forum on Facebook and Google+

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