The direction cosines of the line which ...

The direction cosines of the line which is perpendicular to the lines whose direction cosines are proportional to `1,-1,2` and `2,1,-1` are

A

`(-1)/(sqrt(35)),(5)/(sqrt(35)),(3)/(sqrt(35))`

B

`(13)/(sqrt(35)),(-1)/(sqrt(35)),(1)/(sqrt(35))`

C

`(2)/(sqrt(35)),(5)/(sqrt(35)),(7)/(sqrt(35))`

D

`(3)/(sqrt(35)),(5)/(sqrt(35)),(7)/(sqrt(35))`

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The correct Answer is:

A

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