Question: Let R be the relation on A A, where A = {1, 2, 3, 4}, that is, elements of this relation are pairs of pairs

Let R be the relation on A A, where A = {1, 2, 3, 4}, that is, elements of this relation are pairs of pairs of integers from A, such that ((a, b),(c, d)) R if and only if ad = bc. Is R an equivalence relation? If yes, find its equivalence classes.

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