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

If the plane `2ax-3ay+4az+6=0` passes through the mid point of the line joining the centre 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 `alpha` equals

A

`2`

B

`-2`

C

`1`

D

`-1`

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The correct Answer is:

(b)

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