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[" 2.If the lines "ax+y+1=0,x+by+1=0" an...

[" 2.If the lines "ax+y+1=0,x+by+1=0" and "x+y+c=0" (a,b and "c" being "],[" distinct and different from "1" ) are concurrent,then "(1)/(1-a)+(1)/(1-b)+(1)/(1-c)" is "],[" equal to "]

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