Which of the following relations E are equivalence relations on the set of integers Z? 3. a. xEy if and only if x - y is an even integer. b. xEy if and only if x- y is an odd integer. C. XEy if and only if x < y. d. xEy if and only if x divides y. e. xEy if and only if x2 = y2. f. xEy if and only if |x| = ly]. g. xEy if and only if |x – yl < 2.

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