If the lines \[ax+y+1=0,x+by+1=0\] and \[x+y+c=0\] (a, b, c being dist – McqOptions

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1.	If the lines \[ax+y+1=0,x+by+1=0\] and \[x+y+c=0\] (a, b, c being distinct and different from 1) are concurrent, then \[\frac{1}{1-a}+\frac{1}{1-b}+\frac{1}{1-c}=\]
A.	0
B.	1
C.	\[\frac{1}{a+b+c}\]
D.	None of these
Answer» C. \[\frac{1}{a+b+c}\]

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