ZIP (Zone Improvement Plan) codes, sequences of five digits, were introduced by the United States Post Office

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ZIP (Zone Improvement Plan) codes, sequences of five digits, were introduced by the United States Post Office Department in 1963.

How many ZIP codes are possible? 

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Finite Mathematics And Its Applications

ISBN: 9780137616619

13th Edition

Authors: Larry J. Goldstein, David I. Schneider, Martha J. Siegel , Jill Simmons

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