3. Apply the concept of matrix.
2.1 Define matrix, null matrix, unit matrix, square matrix. column matrix, row matrix, inverse matrix,
transpose matrix, adjoin matrix, rank of a matrix, singular matrix.
2.2 Explain equality, addition and multiplication of matrix.
2.3 Find the rank of a matrix.
2.4 solve the problems of the following types:
i) Solve the given set of linear equations with the help of matrix.
ii) Find the transpose and adjoin matrix of a given matrix