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[lim(n rarr oo)(1)/(n)sum(r=1)^(2n)(r)/(...

[lim_(n rarr oo)(1)/(n)sum_(r=1)^(2n)(r)/(sqrt(n^(2)+r^(2)))" equals : "],[[" (A) "1+sqrt(5)," (B) "-1+sqrt(5)],[" (C) "-1+sqrt(2)," (D) "1+sqrt(2)]]

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