1.

The pole of lx + my = 1 with respect to the ellipse lies on the ellipse (x^2)/(a^2)+(y^2)/(b^2)=4 if:

Answer»

`b^2l^2 + a^2m^2 = 4`
`b^2l^2 + a^2m^2 = 2`
`a^2l^2 + b^2m^2 = 4`
NONE of these

Answer :C


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