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tmua.fyi Paper 2 Challenge 1 · Q14

Paper 2Logic & proof

Let AA and BB be sets with A⊆BA\subseteq B. Which of the following must be true?

AB⊆AB\subseteq A
BA∩B=BA\cap B=B
CA∪B=AA\cup B=A
DA∩B=AA\cap B=A
EAA and BB are disjoint

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