Consider the combination of 2 capacitors $\mathrm{C}_1$ and $\mathrm{C}_2$,, with $C_2>C_1$,, when connected in parallel, the equivalent capacitance is $\frac{15}{4}$ time the equivalent capacitance of the same connected in series. Calculate the ratio of capacitors, $\frac{C_2}{C_1}$. .