binomial expansion

sujith

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Joined
Jul 18, 2014
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4
Hi I have attached the question as a image..
The question numbered 12 is the problem ..
I have expanded (1+x) and by substituting x=-x I
Expanded (1-x) also
Even the coefficient of x5 is shown.
The problem is the next part I am thinking a way with integration but still I cannot figure it ...help me for the Sn part...
 

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