Not sure how to find answers to the 2 problems shown in picture

Write each as a single factorial. The Greek alphabet has 24 letters. How i) 56*6! . many fraternity names can be made using 1 to 3 letters if: a) Repetition of letters is allowed? ii) (n + 3)(n + 2)(n +1)! iii) (n2 + n)(n -1)! b) Repetition of letters is not allowed