1. $O$, $A$ and $B$ are fixed points such that

$\overset{\rightarrow}{OA}=(b+1)i+bj$
$\overset{\rightarrow}{AB}=3i$
The unit vector parallel to $\overset{\rightarrow}{OB}$ is $\frac{\sqrt{17}}{34}[(3a+2)i+bj]$

Given that $a$ and $b$ re constants where $a>0$ and $b>0$

find the exact value of

(i) $a$

(ii) $b$