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Lt(nrarroo) sum(r=1)^n (2r)^k/n^(k+1),k!...

`Lt_(nrarroo) sum_(r=1)^n (2r)^k/n^(k+1),k!=-1`, is equal to (A) `2^k/(k-1)` (B) `2^k/k` (C) `1/(k+1)` (D) `2^k/(k+1)`

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