The image is slightly blurred, but I will try to interpret the content. Based on what I can see:

1. It seems the problem involves a sequence, possibly defined by $u_n$, where an explicit or recursive formula is given. The question involves:
   • Part (a): Fully describing the sequence generated by the $n$-th term formula.
   • Part (b): Writing down an iterative formula for the sequence.

Could you confirm or clarify the blurred sections, such as the exact formula for $u_n$? If needed, I can enhance the visibility of the text by analyzing the image further. Let me know!