Let $p(x)$ be the partition generating function, and let $r(x)=\sum_{n=0}^{\infty} r_nx^n$, where $r_n$ is the number of partitions of $n$ containing no $1$s or $2$s. then $\displaystyle \frac{r(x)}{p(x)}$ is a polynomial. what polynomial is it? (put answer in expanded form)