75. Let Q be the foot of perpendicular from the origin to he plan 4x-3y+z+13=0 and R be a poin (-1,-,-6) on the plane, Then length QR is.

$\left(1\right)\sqrt{14}\left(2\right)\sqrt{\frac{19}{2}}\left(3\right)3\sqrt{\frac{7}{2}}\left(4\right)\frac{3}{\sqrt{2}}$ 75th question

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