\begin{tabular}{|l|l|}
\hline Q.9 & $\begin{array}{l}\text { How many pairs of sets }(S, T) \text { are possible among the subsets of }\{1,2,3,4,5,6\} \\
\text { that satisfy the condition that } S \text { is a subset of } T ?\end{array}$ \\
\hline
- & 729 \\
\hline - & 728 \\
\hline - & 665 \\
\hline - & 664 \\
\hline & \\
\hline
\end{tabular}