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12th Class Mathematics Sample Paper Maths Olympiad Model Paper-7

  • question_answer
    The rank of the matrix \[\left| \begin{matrix}    -1 & 2 & 5  \\    2 & -4 & a-4  \\    1 & -2 & a+1  \\ \end{matrix} \right|\]  is

    A)  2 if \[a=1\]                  

    B)  1 if \[a=-6\]

    C)  1 if \[a=6\]                  

    D)  Both (A) and (B)

    E)  None of these

    Correct Answer: D

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