definite-integral

Question: $\underset{n\to \infty }{\mathop{\lim }}\,\,\left[ \frac{1}{n}+\frac{1}{\sqrt{{{n}^{2}}+n}}+\frac{1}{\sqrt{{{n}^{2}}+2n}}+.....+\frac{1}{\sqrt{{{n}^{2}}+(n-1)n}} \right]$ is equal to



1) $2+2\sqrt{2}$
2) $2\sqrt{2}-2$
3) $2\sqrt{2}$
4) 2
Solution: Explanation: No Explanation
Summation of series by definite Integration

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