MathematicsSetsJAMB
If n(A) = 12, n(B) = 9 and n(A ∩ B) = 4, find n(A ∪ B).
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Answer: B. 17
n(A ∪ B) = n(A) + n(B) − n(A ∩ B) = 12 + 9 − 4 = 17.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.
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