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If the lines ax+ y + 1 = 0 , x + by + 1 ...

If the lines `ax+ y + 1 = 0 , x + by + 1 = 0 and x+ y + c = 0` (a,b and c being distinct and different from 1) are concurrent, then find the value
` 1/(1-a) +1/(1-b)+1/(1-c)`

A

`-2`

B

`-1`

C

1

D

2

Text Solution

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The correct Answer is:
C
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