The input resistance $r_{\mathrm{i}}$ of a transistor is in the range of $1-10 \mathrm{k\Omega }$.

The output resistance $r_0$ of a transistor is in the order of $100 \mathrm{k\Omega }$.

So, the ratio of output resistance and input resistance,

$R=\frac{r_0}{r_i}=\frac{100 \mathrm{k\Omega }}{\left(1-10\right) \mathrm{k\Omega }}$

$\Rightarrow R~{10}^2-{10}^3$