In 1956, the U. S. states and Canadian provinces came to an agreement with the American Association of Motor Vehicle
Administrators, the Automobile Manufacturers Association
and the National Safety Council that standardized the size
for license plates for vehicles with standardized mounting
holes. The first Texas license plate that complied with these
standards was introduced towards the end of that year. The
plate had two Letters followed by 4 numbers. How many
plate numbers could Texas assign in 1956?