1.3. State the conditions for which each of the following is true. \text { a) } A \cup B=A \text { b) } \boldsymbol{B}-\boldsymbol{A}=\boldsymbol{A} \text { c) } A-B=B-A \text { d) } A^{\prime} \cap \Omega=\emptyset \text { e) } A \cap B=A-B

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