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Set Theoryeasy
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Consider the universal set U={1,2,3,4,5,6}U = \{1, 2, 3, 4, 5, 6\}U={1,2,3,4,5,6} and subset A={1,2}A = \{1, 2\}A={1,2}. What is the cardinality of the complement set ∣Ac∣|A^c|∣Ac∣?