\newproblem{ \begin{problem}[4]\estraialfa{3}{a,b,c,x,y,z}{element}List all the elements of the power set (set of subsets) of \[\left\{\elementi, \; \elementii,\; \elementiii\right\}\] \begin{solution} \[\emptyset,\; \left\{\elementi\right\},\;\left\{\elementii\right\},\;\left\{\elementiii\right\},\; \left\{\elementi,\elementii\right\},\;\left\{\elementi,\elementiii\right\},\;\left\{\elementii,\elementiii\right\},\;\left\{\elementi,\elementii,\elementiii\right\}\] \end{solution} \end{problem} } %\newproblem{ %\begin{problem*}[4]\estraialfa{4}{a,b,c,x,y,z}{element}Let $A=\{\elementi,\elementii,\elementiii\}$ and $B=\{\elementi,\elementiii,\elementiv\}$. %\begin{parts} %\item \PTs{2} %List (without repetition) the elements of the set $A\cup B$ %\begin{solution}[3cm] %\[A \cup B=\left\{\elementi,\elementii,\elementiii,\elementiv\right\}\] %\end{solution} %\begin{workarea}{3cm} %$A \cup B=$ %\end{workarea} %\item \PTs{2} %List (without repetition) the elements of the set $A\cap B$ %\begin{solution}[3cm] %\[A \cap B=\left\{\elementi,\elementiii\right\}\] %\end{solution} %\begin{workarea}{3cm} %$A \cap B=$ %\end{workarea} %\end{parts} %\end{problem*} %}