Multiple choice question I — task. Mathematics State Board, Class 9.

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1. If \(U = \{x: x \in N \ \text{and} \ x < 10\}\), \(A = \{1, 2, 3, 5, 8\}\) and \(B = \{2, 5, 6, 7, 9\}\), then \(n[(A \cup B)']\) is .

2. For any three sets \(P\), \(Q\) and \(R\), \(P - (Q \cap R)\) is

\((P \cap Q) - R\)
\((P - Q) \cap (P - R)\)
\(P - (Q \cup R)\)
\((P - Q) \cup (P - R)\)

3. Which of the following is true?

\(A - B = B - A\)
\(A - B = A \cap B\)
\((A \cup B)' = A' \cup B'\)
\((A \cap B)' = A' \cup B'\)

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