.. Express each of the following sets as disjoint unions of intervals, and determine if it isopen, closed, neither or both. \text { i. }(2 \text { marks })(-20,-7] \cap[-9,6) \text { ii. (2 marks) }[\pi, 4] \backslash N \prod_{n=1}^{\infty}(n+2020, n+2022] \bigcap_{n=1}^{\infty}\left[\frac{1}{n}, 5+\frac{2}{n}\right)