Branimir
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 Dec 11 awarded Yearling May 14 awarded Caucus Sep 28 awarded Supporter Sep 27 comment Find the sum to n terms of the series $\displaystyle \frac{1} {1.2.3.4} + \frac{1} {2.3.4.5} + \frac{1} {3.4.5.6}$ You challenged my tex skills :) Try to expand expression for example for n=3, you will see that second addend for "k" is the same but with opposite sign as first addend for "k+1". Sep 27 revised Find the sum to n terms of the series $\displaystyle \frac{1} {1.2.3.4} + \frac{1} {2.3.4.5} + \frac{1} {3.4.5.6}$ more details Sep 27 comment Find the sum to n terms of the series $\displaystyle \frac{1} {1.2.3.4} + \frac{1} {2.3.4.5} + \frac{1} {3.4.5.6}$ Fixed typo in last expression. Is it ok now? Sep 27 revised Find the sum to n terms of the series $\displaystyle \frac{1} {1.2.3.4} + \frac{1} {2.3.4.5} + \frac{1} {3.4.5.6}$ edit last term in 1 to n sum Sep 27 awarded Editor Sep 27 comment Find the sum to n terms of the series $\displaystyle \frac{1} {1.2.3.4} + \frac{1} {2.3.4.5} + \frac{1} {3.4.5.6}$ @Moron Thank for your comment Sep 27 revised Find the sum to n terms of the series $\displaystyle \frac{1} {1.2.3.4} + \frac{1} {2.3.4.5} + \frac{1} {3.4.5.6}$ added 166 characters in body Sep 27 awarded Teacher Sep 27 answered Find the sum to n terms of the series $\displaystyle \frac{1} {1.2.3.4} + \frac{1} {2.3.4.5} + \frac{1} {3.4.5.6}$