3.118 U.S. ZIP codes. The nine-digit ZIP code has become an integral part of the U.S. postal system. a. How many different ZIP codes are available for use by the postal service? (Assume that any nine-digit number can be used as a ZIP code.) b. The first three digits of a Chicago ZIP code are 606. If no other city in the United States has these first three digits as part of its ZIP, how many different ZIP codes can exist in Chicago?

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