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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, c being distinct and different from 1) are concurrent, then = `1/(1-a)+1/(1-b) +1/(1-c)=`

A

0

B

1

C

`1/(a+b+c)`

D

None of these

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The correct Answer is:
B
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