$\begin{array}{1 1} (a)\;\dfrac{7}{8} \bigg(\dfrac{9}{6}\bigg)^t \\ (b)\; \dfrac{7}{48}\bigg(\dfrac{9}{2}\bigg)^t \\ (c)\; \dfrac{7}{24} \bigg(\dfrac{9}{2}\bigg)^t \\ (d)\; \bigg(\dfrac{7}{56}\bigg )\bigg(\dfrac{9}{2}\bigg)^t \end{array}$