JEE Main & Advanced Mathematics Determinants & Matrices Question Bank Expansion of determinants, Solution of equation in the form of determinants and properties of determinants

  • question_answer
    \[\left| \,\begin{matrix}    13 & 16 & 19  \\    14 & 17 & 20  \\    15 & 18 & 21  \\ \end{matrix}\, \right|=\] [MP PET 1996]

    A) 0

    B) - 39

    C) 96

    D) 57

    Correct Answer: A

    Solution :

    Applying \[{{C}_{3}}\to {{C}_{3}}-{{C}_{2}}\]and \[{{C}_{2}}\to {{C}_{2}}-{{C}_{1}}\], we get \[\left| \,\begin{matrix}    13 & 3 & 3  \\    14 & 3 & 3  \\    15 & 3 & 3  \\ \end{matrix}\, \right|=0\] ,  \[\{\because {{C}_{2}}\equiv {{C}_{3}}\}\].


You need to login to perform this action.
You will be redirected in 3 sec spinner