The difference of two sets, A - B, is defined as the set containing all elements of A except those in B. That is, A - B = AN B'. Find A – B for the pair of sets if U = {1, 2, 3, 4, 5, 6, 7, 8, 9}. (Enter your answer in roster notation. Enter EMPTY or ø for the empty set.) A = {3, 5, 9} and B = {2, 4, 6, 7, 8, 9} A -B-

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A: Since you have asked multiple questions in single request.so we will answering only first question.

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Set Theory

Every field in the present world involves a set. The theory of sets was developed by German mathematician Georg Cantor while working on the “problems of trigonometric series”.