Question: as the customer base at ohaganbookscom grows it manager ruth...
As the customer base at OHaganBooks.com grows, IT manager Ruth Nabarro is thinking of introducing identity codes for all the customers, using capital letters and/or numbers. Help her answer the following question:
It appears that Nabarro has finally settled on codes consisting of three letters followed by two digits. For technical reasons, the letters must be different, and the first digit cannot be a zero. How many different customers can be identified?
Please explain the work as i am super confused! Thanks in advance