6. Let \( A=\{1,2,3\} \) and \( B=\{3,4\} \). Find \( A \times B \times B, B \times A, A \times A, B \times B \), and \( (A \times B) \)
7. If \( A=\{1,2,3\} \) and \( B=\{2,4\} \), what are \( A \times B \), common. If \( n(A)=5, n(B)=4 \), find \( n(A \times B) \) and
8. If \( A \) and \( B \) are two sets having 3 elements in common. If \( n(A)=5, n(B)=4 \), for \( n[(A \times B) \cap(B \times A)] \)
