Answer:
a. 10 x 10 x 10 x 26 x 26 x 26 plate numbers
Step-by-step explanation:
The state of Washington uses a system of three numerical digits followed by three letters. Given that there would be 10 numbers available for each digit spot: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 and 26 letters for each of the three letter spots, the overall number of plates would be:
10 x 10 x 10 x 26 x 26 x 26 plate numbers