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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 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

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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)-2x-4y+2z-3=0 and x^(2)+y^(2)+z^(2)+x-y-2z=13 then a equals

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) -1 (B) 1 (C) -2 (D) 2

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

What is the radius of the sphere x^2+y^2+z^2-6x+8y-10z+1=0 ?

What is the radius of the sphere x^2+y^2+z^2-6x+8y-10z+1=0 ?