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check digit
The credit card number is the 16-digit number on the front of the card; the security code is a three- or four-digit number on the back of the card.
A routing number or routing code is a several digit code number used to direct data, documents, or merchandise.
The 12-digit alphanumeric number is called the TMR code number in SSLC marksheet.
I would describe 76499 as a five digit number, possibly a zip code.
The number of 3-digit numbers with no repeated digits is simply 10x9x8 = 720, if you allow, for example, 012 as a 3-digit number. There are 10 digits, any of which might be the first digit. The second digit can be any digit except the digit that was used for the first digit, leaving 9 possibilities. The third digit then has 8 possibilities, since it can't be the same as the first or second digit. The actual number of possible area codes will be lower, because there are additional restrictions on the number combinations for a valid area code. For example, in North America (USA, Canada, etc.), the first digit of an area code cannot be 0 or 1 and the middle digit cannot be 9.
Some possibilities are 720, 566, or 538.
two- digit modifier
If the digits can repeat, then there are 256 possible combinations. If they can't repeat, then there are 24 possibilities.
GEICO insurance company five digit code number
Modifier
Modifier
two- digit modifier
no-3 digit security code on back
check digit
The eighth digit of the vin number is the engine code.
The credit card number is the 16-digit number on the front of the card; the security code is a three- or four-digit number on the back of the card.