First slide

Operations on Sets

Question

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

Moderate

A

3
B

9
C

6
D

None of these

Solution

$\begin{aligned} Since A \subseteq B, ∴ A \cup B = B \\ So, n (A \cup B) = n (B) = 6 \end{aligned}$

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