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Math Help - arithmetic sequences.

  1. #1
    Member M670's Avatar
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    arithmetic sequences.

    So my question is asking whats the first term in this an=2n-4 I know the common difference is 2 and it is arithmetic but can't figure out the first term

    Thanks for any help
    Fyi I tired 0, 1,-2 and n all wrong
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  2. #2
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    Re: arithmetic sequences.

    There are many possibilities, as your question is not stating the set of n's on which a_n is calculated. Sounds like a high school question which typical means n=1 is the first term. What answer do you get for this value?
    Last edited by majamin; March 9th 2013 at 10:35 AM.
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  3. #3
    Member M670's Avatar
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    Re: arithmetic sequences.

    Sadly its a university course and at n=1 I get -2 as an answer but the online homework rejected that as I stated I have tired 0, 1,-2 and n I have one attempt left...
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  4. #4
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    Re: arithmetic sequences.

    That's correct (-2). Very strange indeed and it sounds like there is an error in the question. You could try an answer of 1 (as in, n=1), because the most logical answers are not working. Good luck!
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  5. #5
    Member M670's Avatar
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    Re: arithmetic sequences.

    Now -2 worked I hate webworks
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