Mathematics, 15.04.2021 20:20 hidagiser

Let A be the set of cities in the U. S.A., and let B be the set of the 50 states in the U. S.A. Define the relation R by specifying that (a, b) belongs to R if a city with name a is in the state b. For instance, (Boulder, Colorado), (Bangor, Maine), (Ann Arbor, Michigan), (Middletown, New Jersey), (Middletown, New York), (Cupertino, California), and (Red Bank, New Jersey) are in R.

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