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     EduGorilla 
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    The three lines through the origin with direction cosines l1, m1, n1, l2, m2, n2, and l3, m3, n3 are coplanar, if:

    Options :-

    1. l1 (l2 – l3) + m1 (m2 – m3) + n1 (n2 – n3) = 0
    2. l1 (m2 n3 – m3 n2) + m1 (n2 l3 – m3 l2)  + n1 (l2 m3 – 13 m2) = 0
    3.  ¹ 0
    4. none of these
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Reply To: The three lines through the origin with direction cosines l1, m1, n1, l2, m2, n2, and l3, m3, n3 are….
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