\[Дано:\ \ A = \left\{ м;а;ш;и;н;с;т \right\};\]
\[B = \left\{ п;и;а;н;с;т \right\}.\]
\[Решение:\ \]
\[A \cap B = \left\{ а;и;н;с;т \right\}.\]
\[A \cup B = \left\{ м;а;ш;и;н;с;т;п \right\}.\]