Answer: an = an-1 + 30
Method:
- Each term adds 30 from the previous term.
- Example: The second term (n=2) in your series is -1. -1 is obtained by just adding 30 to the previous term (n=1). To write this generally, for any "n", the number can be obtained by adding 30 to the previous "n". In other words, an = an-1 + 30.
