2 The terms of a sequence are given by
$$\begin{aligned}
u _ { 1 } & = 192 ,
u _ { n + 1 } & = - \frac { 1 } { 2 } u _ { n } .
\end{aligned}$$
- Find the third term of this sequence and state what type of sequence it is.
- Show that the series \(u _ { 1 } + u _ { 2 } + u _ { 3 } + \ldots\) converges and find its sum to infinity.