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

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None of these

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Correct option is C

Since A⊆B,∴A∪B=B So, n(A∪B)=n(B)=6

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If n(A)=3,n(B)=6 and A⊆B . Then the number of elements in A∪B is equal to

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