103 = 1000 in all.
900 ,999 ,909
1,000 of them. The list of possibilities will look exactly like the counting numbers from 000 to 999 .
pizza
As far as I can tell, all 5 digit numbers are potential zip codes, so there are 99999 + 1 potential zip codes, or 100,000. Many of these are not actually is use.
There can be 103 = 1000 codes.
10,000
900 ,999 ,909
1,000 of them. The list of possibilities will look exactly like the counting numbers from 000 to 999 .
24 three digit numbers if repetition of digits is not allowed. 4P3 = 24.If repetition of digits is allowed then we have:For 3 repetitions, 4 three digit numbers.For 2 repetitions, 36 three digit numbers.So we have a total of 64 three digit numbers if repetition of digits is allowed.
pizza
1000
As far as I can tell, all 5 digit numbers are potential zip codes, so there are 99999 + 1 potential zip codes, or 100,000. Many of these are not actually is use.
There can be 103 = 1000 codes.
543210
8877690
There are 210 4 digit combinations and 5040 different 4 digit codes.
If you include 0000, ten thousand unique four digit codes are possible.