If the lines ax+y+1=0, x+by+1=0 and x+y+c=0 (a,b,c are distinct and different from each other) are concurrent, then the value of a+b+c−abc is equal to

If the lines ax+y+1=0, x+by+1=0 and x+y+c=0 (a,b,c are distinct and di

1.	If the lines ax+y+1=0, x+by+1=0 and x+y+c=0 (a,b,c are distinct and different from each other) are concurrent, then the value of a+b+c−abc is equal to
Answer» If the lines $a x + y + 1 = 0$ , $x + b y + 1 = 0$ and $x + y + c = 0$ ( $a, b, c$ are distinct and different from each other) are concurrent, then the value of $a + b + c - a b c$ is equal to

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If the lines ax+y+1=0, x+by+1=0 and x+y+c=0 (a,b,c are distinct and different from each other) are concurrent, then the value of a+b+c−abc is equal to

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