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If the lines a x+y+1=0,x+b y+1=0, and x+...

If the lines `a x+y+1=0,x+b y+1=0,` and `x+y+c=0(a , b , c` being distinct and different from 1) are concurrent, then `(1/(1-a))+(1/(1-b))+(1/(1-c))=` 0 (b) 1 `1/((a+b+c))` (d) none of these

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