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If the direction ratios of two lines are...

If the direction ratios of two lines are given by a + 2b + c = 0 and 11 bc +6ca - 14 ab = 0 . then the angle between these lines is

A

`pi/3`

B

`cos^(-1) (1/3)`

C

`cos^(-1) (2/3)`

D

`pi/2`

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The correct Answer is:
D
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