Since there are five different characters that can be put onto a license plate, we should put 5 blanks down:
___ ___ ___ ___ ___
Next the first two characters must be a-z so that is 26 choices possible total.
26 * 26 * ___ ___ ___
Then the 3rd digit must be 1-9 because it cannot be a 0 or 10 numbers.
26 * 26 * 9 * ___ ___
And finally the fourth and fifth digits are 0-9 or 10 numbers.
26 * 26 * 9 * 10 * 10 = 608400 license plates