Problema Solution
Computers manufactured by a certain company have a serial number consisting of a letter of the alphabet followed by a four-digit number. If all the serial numbers of this type have been used, how many sets have already been manufactured?
Answer provided by our tutors
there are total of 10^4 four digits numbers
since the English alphabet has 26 letters the total number of such serial numbers is
26*10^4 = 260,000