First slide

Operations on Sets

Question

If $n (A) = 3$ and $n (B) = 6$ and $A \subseteq B$ Then the number of elements in $A \cap B$ is equal to

Easy

Solution

since, $A \subseteq B, ∴ A \cap B = A$
$∴ n (A \cap B) = n (A) = 3 .$

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