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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(A - B).
Solution
n(A) = 45, n(B) = 38 and n(A∪ B) = 70
We know that,
n(A-B) = n(A ∪B) - n(B)
n(A – B) = 70 – 38 = 32
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