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Math Help - Series and Sequences help please..

  1. #1
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    Series and Sequences help please..

    if Σ of r=1 to n of U_a is equal to 3n^2+2n , find U_a. Hence find Σ of r=n+1 to 2n of U_a Ans: 6r-1 , 9n^2+2n

    and also
    find sum of: Σ of r=n to 2n of r(2r+3) ans1/6)n(28n^2+57n+29)
    : Σ of r=1 to 3n of r(r^2+1) ans3/4)n(3n+1)(9n^2+3n+2)
    Last edited by jeeee; January 2nd 2013 at 03:52 PM.
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  2. #2
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    Re: Series and Sequences help please..

    and can you give tips on how to find the sum of the series if this case come across...
    Σ of r=n to 2n and also of the r is as usual =1 but to 3n
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