Q: Check 4 digit codes 1-9

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There can be 103 = 1000 codes.

If you include 0000, ten thousand unique four digit codes are possible.

this is impossible

If the first digit can be zero, there are 5,040. If the first digit can't be zero, there are only 4,536.

Add the last digit (units digit) to twice the previous digit (tens digit). If this sum is divisible by 4, so is the original number.

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There can be 103 = 1000 codes.

There are 210 4 digit combinations and 5040 different 4 digit codes.

There are no ten digit zip codes. Maryland has many five digit zip codes and many many more nine digit zip+4 codes. There can be a unique nine digit zip+4 code for every mailbox in a post office building and for at least every block in a town or city!

1, 2, 4

5-digit ZIP Codes started in 1963. ZIP+4 started in the early 1980's, to streamline and automate mail sorting.

If you include 0000, ten thousand unique four digit codes are possible.

We would need to know the specific address. A five-digit ZIP code typically includes hundreds or thousands of nine-digit ZIP+4 codes, since that is the whole point of ZIP+4 codes.

We would need to know the specific address. A five-digit ZIP code typically includes hundreds or thousands of nine-digit ZIP+4 codes, since that is the whole point of ZIP+4 codes.

You will need to provide a specific address. A five-digit ZIP code typically contains hundreds or thousands of ZIP+4 codes, as that is the whole point of ZIP+4 codes.

this is impossible

3077

You will need to provide a specific address. A five-digit ZIP code typically contains hundreds or thousands of ZIP+4 codes, as that is the whole point of ZIP+4 codes.