Results 1 to 6 of 6
Like Tree5Thanks
  • 1 Post By SlipEternal
  • 1 Post By DenisB
  • 1 Post By HallsofIvy
  • 1 Post By DenisB
  • 1 Post By HallsofIvy

Thread: Arithmetic progression

  1. #1
    Newbie
    Joined
    Jul 2017
    From
    US
    Posts
    21

    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



    Sent from my Lenovo A5000 using Tapatalk
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Nov 2010
    Posts
    3,077
    Thanks
    1176

    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 04:13 AM.
    Thanks from goldsomecriss
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Feb 2015
    From
    Ottawa Ontario
    Posts
    1,726
    Thanks
    319

    Re: Arithmetic progression

    If you're not too busy or tired, use google.
    Thanks from goldsomecriss
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Apr 2005
    Posts
    19,514
    Thanks
    2912

    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!
    Thanks from goldsomecriss
    Follow Math Help Forum on Facebook and Google+

  5. #5
    MHF Contributor
    Joined
    Feb 2015
    From
    Ottawa Ontario
    Posts
    1,726
    Thanks
    319

    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?!
    Thanks from goldsomecriss
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor

    Joined
    Apr 2005
    Posts
    19,514
    Thanks
    2912

    Re: Arithmetic progression

    No, I do that to my students all the time! Of course, I'm mean!
    Thanks from goldsomecriss
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 9
    Last Post: Aug 9th 2012, 10:33 AM
  2. Arithmetic Progression or Arithmetic Series Problem
    Posted in the Math Topics Forum
    Replies: 1
    Last Post: Oct 8th 2009, 01:36 AM
  3. Replies: 8
    Last Post: Mar 23rd 2009, 08:26 AM
  4. Arithmetic Progression
    Posted in the Algebra Forum
    Replies: 7
    Last Post: Jun 14th 2008, 12:57 AM
  5. Arithmetic Progression
    Posted in the Algebra Forum
    Replies: 2
    Last Post: Jan 1st 2008, 07:36 PM

/mathhelpforum @mathhelpforum