Final Exams - recursive implementation

I would like to know the limitations on using recursive implementation in the final exams.
Could I use it even if it was not requested? and if so, do I need to show the first circuit used in the recursion?

thank you very much,
Have a terrific day,
Nitzan Shani.

You may present a recursive solution to any circuit you’re required to design (unless specified otherwise). If you choose to present a recursive design, you must include a base case as it is part of the definition of the recursion. Without it the design would be incomplete.