$(2$ points$)$

Show that if $G$ is a bipartite simple graph with vertices and e edges, then $e\frac{v^2}{4}.$

$(2$ points$)$

If $G$ is a simple graph with $15$ edges and $13$ vertices, how many edges does the complentary graph $\frac{?}{\text{b}\text{a}\text{r}}(G)$ have?