The pair of lines whose direction cosines are given by the equation...

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The pair of lines whose direction cosines are given by the equations \( 3 l+m+5 n=0 \) and \( 6 m n-2 n l \) \( +5 \operatorname{lm}=0 \) are
\( \mathrm{P} \)
(1) parallel
(2) perpendicular
(3) inclined at \( \cos ^{-1}\left(\frac{1}{6}\right) \) (4) none of these
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