Ononot — Let U = \{1, 2, 3, 4, 5, 6\}. How many subsets A \subseteq U

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Set Theoryhard

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Let $U = \{1, 2, 3, 4, 5, 6\}$ . How many subsets $A \subseteq U$ satisfy $A \cap \{1, 2, 3\} = \emptyset$ ?