I'm from New Zealand and not from America, so I'm not sure if I am 12th Grade (in NZ we say Year 12). But anyway, my school is rather slack, so if you think this is like 9th Grade stuff, say so.

Anyway, I am having some problems with number sequences. I can do Arithmetic and Geometric, but Recurive stuff bothers me. In case you people have different names for them, here is an example for each:

Arithmetic:
2, 4, 6, 8, 10, 12, ... nth term = 2n

Geometric:
1, 4, 9, 16, 25, ... nth term = n×n #or# (n squared)

Recursive:
1, 1, 2, 3, 5, 8, 13, ... Fibonacci.
Recursive sequences rely on the previous term (and possibly the current term) to get the next term.

I don't understand how to find the formula (so I can get the n term of the sequence) of Recursive sequences.

Cheers to anybody who can understand and/or help me.