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Question
Let A and B be two sets such that n(A) = 75, M(B) = 65 and n(A ∩ B) = 45, find: n(A - B)
Solution
n(A) = 75, n(B) = 65 and n(A ∩ B) = 45
We know that,
n(A – B) = n(A) – n(A ∩ B) n(A – B)
= 75 – 45 = 30
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