Question: solve *24. For any sets A, B, give a necessary and sufficient condition on A, B for the existence of a set X satisfying A

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*24. For any sets A, B, give a necessary and sufficient condition on A, B for the existence of a set X satisfying A \\ X = B, that is, give a condition so that There exists a set X satisfying A\\ X =B Prove that your condition is indeed both necessary and sufficient

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