made changes to matrix questions.
Creating a set:\\
{\ex \lstinline| p10 = set([2, 3, 5, 7]) |t}
Creating set from a tuple or list:\\
{\ex \lstinline| s = set(var_name)|}
Operations on sets. Ex: UNION:\\
{\ex \lstinline| s1 \| s2 |}
Other operations available:\\
\begin{lstlising}
\item "\&" -- Intersection
\item "-" -- Difference
\item "\^" -- Symmetric Difference
\item "<" -- Subset
\end{lstlisting}
Checking for containership:\\
{\ex \lstinline| x in p10|}
Finding the no.of elements:\\
{\ex \lstinline| len(p10)|}