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Let the line L:(x-1)/(2)=(y+1)/(-1)=(z-3...

Let the line `L:(x-1)/(2)=(y+1)/(-1)=(z-3)/(1)` intersect the plane `2x+y+3z=16` at the point `P`.Let the point `Q` be the foot of perpendicular from the point `R(1,-1,-3)` on the line `L`.If `alpha` is the area of triangle `PQR`,then `alpha^(2)` is equal to

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