1.

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

Answer»

n(A ∪ B) = n(A) + n(B) – n(A ∩ B) 

= 7 + 13 – 4 

n(A ∪ B) = 16



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