1. Choose the correct answer

Exercise condition:

3 m.

1. If \(U = \{x : x \in \mathbb{W}\) and \(x < 10\}\), \(P = \{0, 2, 3, 4, 7\}\) and \(Q = \{1, 2, 5, 7, 8, 9\}\), then \(n(P \cup Q)\) \(=\) _______________.

\(8\)
\(10\)
\(7\)
\(9\)

2. If \(A\) and \(B\) are two finite sets, then \(n(A \cap B)\) \(=\) ________________.

\(n(A) + n(B) - n(A \cup B)\)
\(n(A \cup B) - n(A) + n(B)\)
\(n(A) + n(B) + n(A \cup B)\)
\(n(A \cup B) + n(A) + n(B)\)

3. If \(A\) and \(B\) are disjoint sets, then \(n(A \cup B)\) \(=\) _______________.

\(n(A) + n(A \cap B)\)
\(n(A) - n(B)\)
\(n(B) + n(A \cap B)\)
\(n(A) + n(B)\)

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