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JEE Main & Advanced Mathematics Three Dimensional Geometry Question Bank Line

  • question_answer
    If \[\frac{x-1}{l}=\frac{y-2}{m}=\frac{z+1}{n}\]is the equation of the line through   (1, 2, ?1) and (?1, 0, 1), then (l, m, n) is          [MP PET 1992]

    A)                                                               (?1, 0, 1)

    B)                                                               (1, 1, ?1)

    C)                                                               (1, 2, ?1)

    D)                                                               (0, 1, 0)

    Correct Answer: B

    Solution :

                                                                   \[\frac{-2}{l}=\frac{-2}{m}=\frac{2}{n}\];  \[\therefore \,\,\,\,(l,\,\,m,\,\,n)\] are \[(1,\,\,1,\,\,-1)\].


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