Answer
Parallel
Work Step by Step
$n_1=\lt2,-3,-1\gt$ and $n_2=\lt -4,6,2\gt$
Angle between two vectors: $\theta= cos^{-1}|\dfrac{a.b}{|a||b|}|$
$\theta= cos^{-1}|\dfrac{-1}{\sqrt {11} \sqrt {11}}|$
$\theta= cos^{-1}|\dfrac{-28}{\sqrt {14}\sqrt {56}}|$
$=cos^{-1}[-1]$
$=180 ^{\circ}$
Hence, the two planes are parallel.