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  1. \(A \cap B\) will be the set of natural numbers that are both at least 4 and less than 12, and even. That is, \(A \cap B = \{x \in \N \st 4\le x \lt 12 \wedge x \text{ is even}\} = \{4, 6, 8, 10\}\text{.}\)

  2. \(A \setminus B\) is the set of all elements that are in \(A\) but not \(B\text{.}\) So this is \(\{x \in \N \st 4 \le x \lt 12 \wedge x \text{ is odd}\} = \{5,7,9,11\}\text{.}\)

    Note this is the same set as \(A \cap \overline{B}\text{.}\)

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