Convert equation to Riemann sum to definite integral How do you convert this equation to Riemann sum then to definite integral 
$$
\lim_{n \to \infty } \frac{1}{n} \Bigg(\sqrt{\frac{1}{n}} + \sqrt{\frac{2}{n}} + \sqrt{\frac{3}{n}} + ... + \sqrt{\frac{n}{n}} \Big)
$$

HINT: It leads to 
$$
\int_0^1 \sqrt x\,dx.
$$
