A store assigns ID numbers to each product it sells. Each ID number consists of 5 digits from 0 to 9, inclusive. Digits in the ID number can be repeated, but the first digit cannot be 0. How many different combinations for the ID numbers are there?
A store assigns ID numbers to each product it sells. Each ID number consists of 5 digits from 0 to 9, inclusive. Digits in the ID number can be repeated, but the first digit cannot be 0. How many different combinations for the ID numbers are there?