4 On a new website, passwords are required to have 3 letters followed by 2 digits. How many passwords are possible if: a) Repetitions are not oallo wed for either the letters or the numbers. 6)...

I lost my notes for solving this sample question for an upcoming exam. Some help reviewing would be awesome! Thank you!

Extracted text: 4 On a new website, passwords are required to have 3 letters followed by 2 digits. How many passwords are possible if: a) Repetitions are not oallo wed for either the letters or the numbers. 6) Repetitions are allowed for the numb ers, but not the le#ers.