103 = 1000 in all.
1,000 of them. The list of possibilities will look exactly like the counting numbers from 000 to 999 .
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.
If you include 0000, ten thousand unique four digit codes are possible.
The number of 4 digit codes, using different digits, is 10*9*8*7 = 5040. However, computer passwords can, usually, have repeated digits and, if that is allowed, you can have 104 = 10000 codes.
10,000
103 = 1000 in all.
1000
1,000 of them. The list of possibilities will look exactly like the counting numbers from 000 to 999 .
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.
If you include 0000, ten thousand unique four digit codes are possible.
The number of 4 digit codes, using different digits, is 10*9*8*7 = 5040. However, computer passwords can, usually, have repeated digits and, if that is allowed, you can have 104 = 10000 codes.
8 digits.
Self complimentary codes are codes which after certain number of digits extends itself by taking the compliment of the previous digits.
100,000 - Every number from 00000 to 99999.
10*9*8*7*6=30,240
If the digits can be any number from 0 to 9 and there are no restrictions on a number being used more than once then you have 10 choices for each digit and 26 choices for the letter. The total number of possible codes is 10 x 10 x 10 x 10 x 10 x 26 = 2600000