Let $\displaystyle G$ be a graph of order $\displaystyle n$ and size strictly less than $\displaystyle n-1$. Prove that $\displaystyle G$ is not connected.
Let $\displaystyle G$ be a graph of order $\displaystyle n$ and size strictly less than $\displaystyle n-1$. Prove that $\displaystyle G$ is not connected.