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Math Help - Help with Sequences and Series Problem

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    Help with Sequences and Series Problem

    The sum of the first twelve terms of an arithmetic sequence of real numbers is 60. The first term is -6. What is the sum of the first twenty terms?
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    Re: Help with Sequences and Series Problem

    Quote Originally Posted by Espionage View Post
    The sum of the first twelve terms of an arithmetic sequence of real numbers is 60. The first term is -6. What is the sum of the first twenty terms?
    Suppose that S_n is the sum of the first n terms and d is the common difference then S_n=a+(n-1)d where a is the first term.
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    Re: Help with Sequences and Series Problem

    Thank you very much.
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