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    g n=n/2 (a+l) =n/2(a+l)

    gn0+12+60+168+360+660


    a=0  ,d=12,  l=

    0  Views: 577 Answers: 1 Posted: 14 years ago
    Bob/PKB

    There is no "d" in this equation. Please?

    1 Answer

    Here, go to this site: http://www.khanacademy.org/



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