In the hydrogen atom spectrum, ${\lambda }_{3-1}$ and ${\lambda }_{2-1}$ represent wavelengths emitted due to transition from second and first excited states to the ground state respectively. The ratio $\frac{{\lambda }_{3-1}}{{\lambda }_{2-1}}=\frac{p}{q}$, where $p$ and $q$ are the smallest positive integers. What is the value of $\left(p+q\right)$?