If rank is a number associated with a matrix which is the highest order of non-singular sub matr...

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If rank is a number associated with a matrix which is the highest order of non-singular sub matrix then prove that
P
Rank of the matrix \( A=\left[\begin{array}{ccc}1 & 3 & -2 \\ 4 & -1 & 0 \\ 2 & -7 & 4\end{array}\right] \)
is 2
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