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.
1344
You can make 916,132,832 different five-character passwords if the code can be a mixture of letters and digits in any order and is case sensitive.
7
3!*3!=36For example, if you want to use the alphabets a,b,c and three digits 1,2,3 you can make the following 36 different passwords (3 letters followed by 3 digits)abc123abc132abc231abc213abc312abc321acb123acb132acb231acb213acb312acb321bca123bca132bca231bca213bca312bca321bac123bac132bac231bac213bac312bac321cab123cab132cab231cab213cab312cab321cba123cba132cab231cab213cab312cab321
The different digits have different values.
1344
The number of password options available could be endless. If each password must consist of 4 symbols with the first one being a letter and the rest a number, you have 26000 possibilities.
You can make 916,132,832 different five-character passwords if the code can be a mixture of letters and digits in any order and is case sensitive.
11 DIGITS
All the digits matter so if there is an extra digit it is a different computer.
7
3!*3!=36For example, if you want to use the alphabets a,b,c and three digits 1,2,3 you can make the following 36 different passwords (3 letters followed by 3 digits)abc123abc132abc231abc213abc312abc321acb123acb132acb231acb213acb312acb321bca123bca132bca231bca213bca312bca321bac123bac132bac231bac213bac312bac321cab123cab132cab231cab213cab312cab321cba123cba132cab231cab213cab312cab321
Yes, it is possible for an account number to consist of only 7 digits.
Yes, it is possible for a debit card PIN to consist of 6 digits.
In the context of computer memory, an address is used to access the computer's primary storage memory. These addresses consist of fixed-length digits displayed as unsigned integers.
1000000
5040