[" Q.54If the lengths of the tangents dr...

[" Q.54If the lengths of the tangents drawn from the "],[" point "(1,2)" to the circles "x^(2)+y^(2)+x+y-4=0],[" and "3x^(2)+3y^(2)-x-y+k=0" be in the ratio "4:3" ,"],[" then "k=],[[" (A) "21/2," (B) "7/2," (C) "-21/4" (D) "7/4]]

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