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n(A) = 5, n(A ∪ B) = 7, and n(B) = 5,
then what is
n(A ∩ B)?
n(A ∪ B) =n(A)+n(B) - n(A ∩ B)
therefore n(A ∩ B) =n(A)+n(B) - n(A ∪ B)
substituting values we get n(A ∩ B) = 5+5-7 =3
Answer : n(A ∩ B) = 3
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