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\(\pow(A)\)
is a set of sets, all of which are subsets of
\(A\text{.}\)
So
\begin{equation*} \pow(A) = \{ \emptyset, \{1\}, \{2\}, \{3\}, \{1,2\}, \{1, 3\}, \{2,3\}, \{1,2,3\}\}\text{.} \end{equation*}
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