1) A course code at Canisius consists of three upper-case letters followed by a non-zero digitfollowed by two more digits. How many possible course codes are there?
2) A variable name in the language C++ starts with a letter and can be followed by zero or moreletters, digits, and underscore characters. How many possible five-character variable names arethere?
3) Passcodes are defined to be any combination of lower-case letters and numbers. How many five-character passcodes are there that contain at least one digit? Be sure to use the complementmethod in determining your answer.