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konichiwa2x (2373)

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Olaaa!! Perrrfect answer. 445  [519 rates]

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Consider any
 
  

Hence  and 
and so on..
Hence in the summation , the sum of the first n-1 terms and the last n-1 terms is 1. This leaves the middle term which is

Hence, ..

Guide to latex:
http://www.goiit.com/posts/list/community-shelf-a-guide-to-latex-48056.htm

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