How one functn calld other in recursion

Question

I am very confused
Any body help

Answer 1

Your code isn't linked to the question. Link it properly by tapping at insert code then select my Codes.

Answer 2

Is it this? The even-odd example?

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2465/