Limit of limits 2

Calculus Level 3

limn1nr=12nrn2+r2= ?\Large \lim _{ n\rightarrow \infty } \frac { 1 }{ n } \sum _{ r=1 }^{ 2n }{ \frac { r }{ \sqrt { { n }^{ 2 }+{ r }^{ 2 } } } } = \ ?

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