Can you help me please?

Hello guys,
I am really sorry for disturbing you, and I really do not know how this forum works, but I need your help. I am working with some exercises but I can not understand one of them which is related with recursive functions. It is really hard for me, I have tried for hours... I wish I could post the question here, but everything is monitored by my school. Can you sent me a private form of communication because I really need your help and I would apppriciate it a lot. Thank you very much again.
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