Find the $20^{th}$ term of the $G.P.\:\:\large\frac{5}{2},\frac{5}{4},\frac{5}{8},..........$

Question

$\begin{array}{1 1}\large\frac{5}{2}.\big(\frac{1}{2}\big)^{19} \\\large\frac{5}{2}.\big(\frac{1}{2}\big)^{20} \\\large\frac{5}{4}.\big(\frac{1}{2}\big)^{19} \\ \large\frac{5}{4}.\big(\frac{1}{2}\big)^{20} \end{array} $