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Thread: Arithmetic progression

  1. #1
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    Arithmetic progression

    Given the sum of the first n terms of a series is given by Sn =nē+2n for n >1. how to determine an expression for the rth term , Ur? I have totally no idea for this question...can anyone help me?

    Algebra



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  2. #2
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    Re: Arithmetic progression

    $S_n=U_1+U_2+\ldots +U_{n-1}+U_n $

    $S_{n-1}=U_1+U_2+\ldots +U_{n-1}$

    $U_n=S_n-S_{n-1} $
    Last edited by SlipEternal; Jul 28th 2017 at 03:13 AM.
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  3. #3
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    Re: Arithmetic progression

    If you're not too busy or tired, use google.
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  4. #4
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    Re: Arithmetic progression

    Quote Originally Posted by DenisB View Post
    If you're not too busy or tired, use google.
    But if people did that, there would never be any easy questions that I could answer!
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  5. #5
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    Re: Arithmetic progression

    Quote Originally Posted by goldsomecriss View Post
    I have totally no idea for this question
    Funny Halls!
    Doesn't it make you wonder why students are given
    problems that they have NO IDEA how to solve?!
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  6. #6
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    Re: Arithmetic progression

    No, I do that to my students all the time! Of course, I'm mean!
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