1. The plate number system for the four-wheeled vehicles in the country of Dominian consist of 3 letters and 4 digits. The first letter signifies the states where the vehicle was registered and there are 15 states . The second letter signifies if the vehicle is for public or private used. If there are no restrictions on the remaining letter and 4 digits, how many plate numbers for 4-wheeled vehicles will be available in the Dominian ?

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