1.

Let a, b and c be distinct and none of them is equal to 1. If the lines x + ay + a= 0, bx + y + b = 0 and cx + cy + 1 = 0 are concurrent, then the value of (a)/(a-1) + (b)/(b-1) + (c )/(c-1) is

Answer»

1
`-1`
2
0

Answer :A


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