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Parametric equation fo a line are x=x1+l...

Parametric equation fo a line are `x=x_1+lr,y=y_1+mr, z=nr,` where (A) r is the distance of `(x_1,y_1,z_1)` from origin (B) r is the distant `(x,y,z)` form origin (C) `|r|` is the distasnt of `(x,y,z)` from `(x_1,y_1,z_1)` (D) none of these

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