The dr's of two lines are given by a+b+c...

The dr's of two lines are given by `a+b+c=0,2ab +2ac-bc=0`. Then the angle between the lines is

A

`pi`

B

`(2pi)/(3)`

C

`(pi)/(2)`

D

`(pi)/(3)`

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The correct Answer is:

(b)

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