Q11 of 43 Page 16

If n(A) = 7, n(B) = 13, n (A ∩ B) =4 then n (A ∪ B) = ?

Given:

As we know, n (A ∪ B) = n(A) + n(B) - n (A ∩ B)


⇒ n (A ∪ B) = 7 + 13 - 4


⇒ n (A ∪ B) = 20 - 4


⇒ n (A ∪ B) = 16


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