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if you are going from -5 to inf, the first of sequence would be 25

does that make sense? so the series shouldn't start from -5

if you put that as n into the equation and see what values you get, it would be more clear for you

& sorry for all the questions..

sorry i get my terminologies confused

Wait, so what does all that mean?

so simply, your index term for summation is starting at wrong point

& that is my bottom number, right?

I just reread your first statement. I think so too. >.<

Okay, since y'all know are on the same page now, Lol, what did I do wrong...?

Okay, but what should I try? Like there has to be a method to the madness.

Wait. are you summing the terms in the list or just producing the list?

If you fill in the index part of the table above, the first index is your starting index.

So by doing this I find out what goes underneath the stigma?

Yes and why it's important.