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If the plane 2ax-3ay+4az+6=0 passes thro...

If the plane `2ax-3ay+4az+6=0` passes through the midpoint of the line joining centres of the spheres `x^2+y^2+z^2+6x-8y-2z=13 and x^2+y^2+z^2-10x+4y-2z=8` then a equals (A) `2 (B) -2 (C) 1 (D) -1

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