15. If the lines ax+y+1=0, x+by+1=0, x+y+c=0 (a,b and c are distinct and different from 1) are concurrent then the value of a/(a-1) + b/(b-1) + c/(c-1) is a)0. b)1. c)2. d)3.

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a x + y + 1 = 0, x + b y + 1 = 0

x + y + c = 0 (a, b, c

1)

\frac{1}{1 - a} + \frac{1}{1 - b} + \frac{1}{1 - c}

a x + y + 1 = 0, x + b y + 1 = 0

x + y + c = 0

\frac{1}{1 - a} + \frac{1}{1 - b} + \frac{1}{1 - c} =

a x + y + 1 = 0

x + b y + 1 = 0

x + y + c = 0

a, b, c

a + b + c - a b c

a x + y + 1 = 0, x + b y + 1 = 0, and x + y + c = 0 (a, b, c being different from 1)

\frac{1}{1 - a} + \frac{1}{1 - b} + \frac{1}{1 - c}

a x + y + 1 = 0, x + b y + 1 = 0, and x + y + c = 0 (a, b, c being different from 1)

\frac{1}{1 - a} + \frac{1}{1 - b} + \frac{1}{1 - c}

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