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Question
Let A and B be two sets such that n(A) = 45, n(B) = 38 and n(A ∪B) = 70, find: n(B – A)
Solution
n(A) = 45, n(B) = 38 and n(A∪ B) = 70
We know that,
n(B – A) = n(A ∪ B) – n(A)
n(B – A) = 70 – 45 = 25
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