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If for a gt 0, the feet of perpendicula...

If for `a gt 0,` the feet of perpendiculars from the points A(a, - 2a, 3) and B(0,4,5) on the plane Ix +my+nz=0 are points c(0, -a, -1) and D respectively, then the length of line segment CD is equal to :

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