If n \in N^+ , prove \dfrac{1}{2}\leq\dfrac{1}{n+1}+\dfrac{1}{n+2}+\dots+\dfrac{1}{2n}<1 Steven Zheng posted 3 months ago 0 0 0
\because n < n+k <2n \therefore \dfrac{1}{2n} <\dfrac{1}{n+k}<\dfrac{1}{n} Steven Zheng posted 3 months ago