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I have posted a link there to this topic so the OP can see my work.How to define Recursive Formula?

I had trouble understanding this in class and I'm totally behind!

how would you solve this sequence?

1. a subscript 1 = 1; a subscript n = -a subscript n -1

2. a subscript 1 = 2; a subscript n = -a subscript n -1

3. a subscript 1 = -2; a subscript n = n + 3a subscript n -1

And how would you find the next 5 terms?