1.

Number of square sub-matrices of order 2 (sub-matrix is obtained by deleting appropriate number of rows and columns in a given matrix) that can be formed from the matrix \[\left[ \begin{matrix}    1 & 2 & -1 & 4  \\    2 & 4 & 3 & 5  \\    -1 & -2 & 6 & -7  \\ \end{matrix} \right]\] is

A. 12
B. 15   
C. 18
D. \[{{2}^{12}}\]
Answer» D. \[{{2}^{12}}\]


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