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14. (9%) Let R be the relation on the set of ordered pairs of positive integers such that ((a,b), ...
14. (9%) Let R be the relation on the set of ordered pairs of positive integers such that ((a,b), (c,d)) € R if and only if ad = be. bc. = (a) Show that R is an equivalence relation. (b) What is the equivalence class of (1,2) with respect to R?