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1. Is there a relationship between A X B and 732(A U B)? 2. Prove or disprove and salvagel, if possible: A function f :

1. Is there a relationship between A X B and 732(A U B)? 2. Prove or disprove and salvagel, if possible: A function f : A -+ B is injective if and only if for all y E B the set f_1({ y }) contains exactly one element

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