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ZIP Codes are 5-digit numbers developed by the United States Postal Service to represent individual post offices across the United States. "ZIP Code" is the name of the postal code system for the United States.

Hence, there are 10,000 possible 4-digit zip codes if there are no restrictions on the digits used.

Thus there are 1,000,000,000 different ZIP codes. (b) There are 10 possible digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. A ZIP code is a number consisting of 9 digits.

When it comes to USA zip codes, they are always 5 digits long. However, sometimes these codes may also include leading zeros. If you store these zip codes as integers, any leading zeros would be stripped, resulting in missing data. As such, it's usually better to store zip codes as 5 character strings.

Answer and Explanation: There are 100,000 possible 5-digit zip codes if digits can be repeated. For each of the 5 digits of the zip code, there are 10 possible digits we can use (0, 1, 2, 3, 4, 5, 6, 7, 8, 9).

The Postal Code Validation validates the postal codes for countries and cities and provides the cleaned postal code as a response. The correctly formatted postal codes are mandatory to process a shipment or create shipping labels.

1 Expert Answer There are ten possible digits (0 to 9). This means 100000 possible zip codes if repeatable. 540 * 56 = 30240 zip codes without any repetitions.

6 places and 10 digits that can take the positions with repetition allowed=10×10×10×10×10×10 =10^6 pin numbers are possible. The answer will be 10^6 = 1,000,000 or 1 million.