Suppose, $$in addition,$$that $$Ct $=4+\mathrm{.}5$ Ct$-1+$ act$$ and$$ It $=6+\mathrm{.}6$ It$-1+$aIt$,$where the a$$s $$are white noise.$$

$30.$Cn$(1)=?$

None of these

$9$

$5$

$66$

$4$

$3$ points $$

Question $31$

$31.$ In$(1)=?$

$16$

None of these$$

$6$

$66$

$\mathrm{.}6$