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[" 206.If circles "x^(2)+y^(2)+2ax+c=0" ...

[" 206.If circles "x^(2)+y^(2)+2ax+c=0" and "],[x^(2)+y^(2)+2by+c=0" touch each other,then "],[[" (A) "(1)/(a)+(1)/(b)=(1)/(c)," (B) "(1)/(a^(2))+(1)/(b^(2))=(1)/(c^(2))],[" (C) "(1)/(a)+(1)/(b)=c^(2)," (D) "(1)/(a^(2))+(1)/(b^(2))=(1)/(c)]]

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