The value of lim(n to oo)(1)/(n).sum(r=1...

The value of `lim_(n to oo)(1)/(n).sum_(r=1)^(2n)(r)/(sqrt(n^(2)+r^(2)))` is equal to

`1+sqrt5`

`-1+sqrt5`

`-1+sqrt2`

`1+sqrt2`

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