n term: S = 1 - (1/N+1) = (N+1/N+1) - (1/N+1)

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S= 1- (1/N+1)

Which is the same as S= (N+1/N+1) - (1/N+1), but how does (N+1/N+1) - (1/N+1) equals n/n+1 ?
 
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