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Use the column matrix, [ -1 ] [ 3 ]
ya yes its there a matrix called zero matrix
Rank of a matrix is used to find consistency of linear system of equations.As we know most of the engineering problems land up with the problem of finding solution of a linear system of equations ,at that point rank of matrix is useful.
It builds up callous.
a squar matrix A is called involutary matrix. if A^2=I