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Math Help - evaluate the sum

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    evaluate the sum

    Evaluate the sum
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    Quote Originally Posted by tbenne3 View Post
    Evaluate the sum
    What is the first term of the series?
    What is the common diffidence of this arithmetic progression?
    What is the number of terms?
    What is the formula for the sum of the arithmetic progression?
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    MHF Contributor matheagle's Avatar
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    Quote Originally Posted by tbenne3 View Post
    Evaluate the sum
    7\left({(40)(41)\over 2}\right) +8(40)
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