SOLUTION: n(A-B)=30 and n(AUB)=130.find n(B).

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Question 1085981: n(A-B)=30 and n(AUB)=130.find n(B).
Answer by ikleyn(52781) About Me  (Show Source):
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n(B) = 130 - 30 = 100.

Since B = (AUB) \ (A-B) (which is OBVIOUS).