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Math Help - Arithmetic series

  1. #1
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    Arithmetic series

    Determine the number of terms n

    a1=19, an=96, Sn=690

    Im a bit stuck on what to do here?
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  2. #2
    MHF Contributor harish21's Avatar
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    S_n=\dfrac{n}{2}(a_1+a_n)
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