# Thread: [SOLVED] credit card combinations problem

1. ## [SOLVED] credit card combinations problem

with a credit card the first six digits that appear on the card are to identify the issuer. How many issuers are there given each digit 0-9 can be used more than once.

this problem has slipped my mind, I know it sounds easy, but forgot how to do these types of problems, can someone please help

2. Originally Posted by mandy123
with a credit card the first six digits that appear on the card are to identify the issuer. How many issuers are there given each digit 0-9 can be used more than once.

this problem has slipped my mind, I know it sounds easy, but forgot how to do these types of problems, can someone please help
$10^6$ assuming 000000 is a legitimate string of digits.