From the figure, we can see that the coordinates of point O are (0, 0, 0) and the coordinates of point A are (0.8, 0.3, 0.6). Therefore, the position vector $r_{OA}$ is:
$r_{OA} = (0.8 - 0)i + (0.3 - 0)j + (0.6 - 0)k = 0.8i + 0.3j + 0.6k$
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