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December 19th, 2012, 12:07 PM  #1 
Newbie Joined: Dec 2012 Posts: 3 Thanks: 0  Summation of series.
Use the formulae for r^3, r^2, and r, where appropriate to find 2n *sigma notation* r^2(1+r) r=1 I'm struggling with this one; I have already done two questions on this, but I can't seem to do this one, and I can't upload pictures of working out because the site says the file is too big. 
December 19th, 2012, 12:44 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,807 Thanks: 716  Re: Summation of series. Quote:
 

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