I saw this question on a challenge. What is p, n also what does (a,2) stand for?

Question

I need someone to help me understand this.

https://code.sololearn.com/cxmWo3VFI3si/?ref=app

Answer 1

Print often helps to understand.
Here I printed tue enumeration .
2+3+4+5=14

https://code.sololearn.com/cy6e3436iCF3/?ref=app

Answer 2

Thanks guys. Now I understand. So if enumerate (a), p starts at 0, or enumerate (a, 5), p starts at 5 right?

Answer 3

✌

Answer 4

P=a, n=2