Computers Manufactured by a Certain Company Have a Serial Number

Multiple Choice

Computers manufactured by a certain company have a serial number consisting of a letter of the alphabet followed by a five-digit number. If all the serial numbers of this type have been used, how many sets have already been manufactured? ​

A) 4,470,000 sets
B) 4,160,000 sets
C) 3,880,000 sets
D) 2,670,000 sets
E) 2,320,000 sets
F) 2,600,000 sets