SOLUTION: If n(A) = 102, n(A u B) = 140, and n(A ∩ B) = 41, find n(B)

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Question 675842: If n(A) = 102, n(A u B) = 140, and n(A ∩ B) = 41, find n(B)
Answer by MathLover1(20850) About Me  (Show Source):
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n(A) = 102, n(A u B) = 140, and n(A ∩ B) = 41, find n(B).
nB=n(A u B)-(n(A)-n(A ∩ B))
nB=140-%28102-41%29
nB=140-61
nB=79