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I have(( n - 1)/(n+1))^n² by using root criteria for series convergence I arrived to this:((n-1)/(n+1))^n I don't remember how to trasform it in(1-2/n)^n -> e^-2Does it correct do this:(n-1)/(n+1) -> [I don't remember this!! ] (n-1-1)/n and a then (n-2)/n (1-2/n) ?? Thx 2 all
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