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1. \(\displaystyle A \cap B = \{3,4,5\}\text{.}\)

2. \(\displaystyle A \cup B = \{1,2,3,4,5,6,7\}\text{.}\)

3. \(\displaystyle A \setminus B = \{1,2\}\text{.}\)

4. \(\displaystyle A \cap \overline{(B \cup C)} = \{1\}\text{.}\)