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[" 70.If the circles "x^(2)+y^(2)+2x+2ky...

[" 70.If the circles "x^(2)+y^(2)+2x+2ky+6=0" and "x^(2)+y^(2)+2ky+k=0" intersect orthogonally,then "k=],[[" (A) "2," (B) "-2," (C) "-(3)/(2)," (D) "(3)/(2)]]

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