1.

Three lines drawn from origin with direction cosines l_1,m_1,n_1 , l_2, m_2,n_2 , l_3,m_3,n_3 are coplanar iff : |(l_1,m_1,n_1),(l_2,m_2,n_2),(l_3,m_3,n_3)|=0 since :

Answer»

intersecting LINES are coplanar
it is POSSIBLE to FIND a LINE perpendicular to all these lines
all lines pass through origin
None of these.

Answer :A


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