- A sequence \(a _ { 1 } , a _ { 2 } , a _ { 3 } , \ldots\) is defined by
$$\begin{aligned}
a _ { n + 1 } & = 4 - a _ { n }
a _ { 1 } & = 3
\end{aligned}$$
Find the value of
- \(a _ { 2 }\)
- \(a _ { 107 }\)
- \(\sum _ { n = 1 } ^ { 200 } \left( 2 a _ { n } - 1 \right)\)