1.

If the equation of the plane passing through the line of intersection of the panes ax + by + cz +d=0, a _(1) x + b _(1) y + c _(1) z + d _(1) =0 and perpendicular to the XY-plane is px + py + rz + s =0 then S =

Answer»

`DC _(1)-d _(1) C `
`dc _(1) + d _(1)c `
`d d _(1) + c c_(1)`
`a a _(1) + B b_(1) + c c _(1)`

ANSWER :A


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