Let A and B be two sets such that


Let $A$ and $B$ be two sets such that $n(A)=5, n(B)=3$ and $n(A \cap B)=2$.

(i) $n(A \cup B)$

(ii) $n(A \times B)$

(iii) $n(A \times B) \cap(B \times A)$



(i) $n(A \cup B)=n(A)+n(B)-n(A \cap B)$



(ii) $n(A \times B)=n(A) \times n(B)$

$=5 \times 3$


(iii) $n(A \times B) \cap(B \times A)=n(A \times B)+n(B \times A)-$


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