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Rank of a

If the determinant of A of size n x n is zero, then it is possible that there are two identical rows or columns. Or, algebraic sum of some rows or columns is equal to a row or column. Then the rank cannot be n.

We remove one of the identical rows or columns and then find the determinant of n-1 x n-1 matrix. If its determinant is non zero, then n-1 will be the rank of the matrix A.

Determinant is found by the usual method.

Determinant is zero because 3nd row is a multiple of 2nd row.

Let us remove the third row and column. and find the determinant again of the 2x2 matrix.

**square matrix**is found by finding the determinant. If the determinant is non-zero, the dimension of the square matrix is the rank.If the determinant of A of size n x n is zero, then it is possible that there are two identical rows or columns. Or, algebraic sum of some rows or columns is equal to a row or column. Then the rank cannot be n.

We remove one of the identical rows or columns and then find the determinant of n-1 x n-1 matrix. If its determinant is non zero, then n-1 will be the rank of the matrix A.

Determinant is found by the usual method.

Determinant is zero because 3nd row is a multiple of 2nd row.

Let us remove the third row and column. and find the determinant again of the 2x2 matrix.