A and B are two sets having $3$ elements in common. If $n (A) = 5, n (B) = 4$ , then what is $n (A \times B)$ equal to?

0

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9

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15

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20

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Solution

The correct option is D $20$
If $n (A) = 5$ and $n (B) = 4$

For this type cases we know that the formula for the no. of elements in $n (A \times B)$ = $5 \times 4 = 20$

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If A and B are two sets having 3 elements in common. If n(A) = 5 and n(B) = 4, find $n [(A \times B)$ and $n (A \times B) \cap (B \times A)]$ .

3

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