3. Let R denote the set of real numbers. For each of the following subsets of Rx R, determine whether it is equal to the Cartesian product of two subsets of R . a) {(x, y)|x is an integer}. b) {(x, y)|0< y<1}. c) {(x, y)| y > x}. d) {(x, y)|x is not an integer and y is an integer}. e) {(x, y)| x² + y² <1}.

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A:

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