The standard license plates take 3 letters followed by four digits. ex. ABC 1234 Assume that all plates are non-controversial and meet state restrictions (although we know this is not the case0.
a. how many license plates are possible without repetition of letters or numbers?
b. the standard issue license will repeat letters and/or numbers in the same style (3 letters followed by 4 numbers. How many standard issue plates are available.
Thank you in advance! Susan