a. Password must be 8 characters long. Can be comprised of any arrangement of numbers and letters. How many potential passwords can be created? Explain/show your work.

Upper case and lower case are not distinguishable, and repeating is not allowed

. Password must be 8 characters long. Can be comprised of any arrangement of numbers, letters followed by four special characters from (!, $, *, _, -). How many potential passwords can be created? Explain/show your work. Upper case and lower case are not distinguishable, and no repeating is allowed.