You're working with base-26 (if your only letters are A-Z) then it would be taken to the 3rd power. 26^3 = 17576 possible combinations. Perplexed

Also you have base-10 for the first three digits, 1000 possible combinations (10^3) ...

What are the total possible combinations for this state's license plate? I'd guess 1000 x 17,576= 17,576,000 (for 000-ZZZ only) and 17576000 x 2 = 35,152,000 (for 000-ZZZ and ZZZ-000 formats)  Perplexed