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

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

A

0

B

1

C

`(1)/(a+b+c)`

D

`3 abc`

Text Solution

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The correct Answer is:
B
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