Let P be the foot of the perpendicular from the point $Q(10, - 3, - 1)$ on the line $\frac{{x - 3}}{7} = \frac{{y - 2}}{{ - 1}} = \frac{{z + 1}}{{ - 2}}$ . Then the area of the right angled triangle P Q R, where R is the point (3,–2,1), is
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