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Direction-cosines ( l,m,n) of two straig...

Direction-cosines `( l,m,n)` of two straight lines are given by relations `al +2m+3n=0 and bmn+3nl+4lm=0.` If straight lines are perpendicular to each other then the value of `[b/a]` is (where [.]J is greatest integer function) (A) `-3` (B) `-1` (C) `1` (D) `3`

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