#### Problem 64E

64. (a) Determine whether the sequence defined as follows is comergent or divergent:

$$\begin{array}{lll}a_{1}-1 & a_{\mathrm{e}+1}-4-a_{n} & \text { for } n 3<1\end{array}$$

(b) What happens if the first term is $a_{1}-2 ?$