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Given A = {1, 2, 3, 4, 5, 6...20}, R is defined on A as follows. For all x, y belongs to A x Ry

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Given A = {1, 2, 3, 4, 5, 6...20}, R is defined on A as follows. For all x, y belongs to A x Ry doubleheadarrow 4|(x - y). Is R an equivalence relation on A? Give reasons for your answer. If R is an equivalence relation what are the equivalence classes

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