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qwer: 10

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Which of the following statements is /are False?
  1. $\{2,3,4\} \in A$ and $\{2,3\} \in B$ implies that $\{4\} \subseteq A-B$.
  2. $A \cap B \supseteq\{2,3,4\}$ implies that $\{2,3,4\} \subseteq A$ and $\{2,3,4\} \subseteq B$.
  3. $A-B \supseteq\{3,4\}$ and $\{1,2\} \subseteq B$ implies that $\{1,2,3,4\} \subseteq A \cup B$.
  4. $\{2,3\} \subseteq A \cup B$ implies that if $\{2,3\} \cap A=\emptyset$ then $\{2,3\} \subseteq B$.
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