use the union rule to answer the question.  If n left parenthesis Upper A intersect Upper B right parenthesisn (A∩ B)equals=5, n left parenthesis Upper A union Upper B right parenthesis (A∪B)equals=30 and n left parenthesis Upper A right parenthesisn(A)equals=18​, what is n left parenthesis Upper B right parenthesis question markn(B)?

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