Recursion and for-loops equivalent? example in C#

Question

I wrote a short little C# program to demonstrate the equivalence of the 3 concepts:
(1) for-loop
(2) recursion
(3) while-loop
I would be very pleased, if you could review my code and verify or falsify it.
https://code.sololearn.com/ctfqg0bGq8pD/#cs

Answer 1

Please don't put this in Q&A, as it's just for question... :)