business maths for XI-A

A matrix having m rows and n columns is called square if

• m > n

• m < n

• m = n

• m + n

A column matrix comprises single column and

• Single row

• Two rows

• At least two rows

• infinite rows

If A is a matrix and | A | = 0 then matrix A is called

• Singular matrix

• Nonsingular matrix

• Scalar matrix

• unit matrix

Inverse of matrix A is defined as the fraction of

• A and Adj ( A )

• | A | and Adj ( A )

• Adj ( A ) and A

• Adj ( A ) and | A |

The matrix [ 2x   -4]

                    [ -1    2 ] will be singular for the value of  x 
                    

• 0

• 1

• 2

• 3

If A is of order m x n and B is of order n x m matrices, then AB will be of order

• m x n

• n x m

• m x m

• n x n

The matrix [ 2 0 ]

[ 0 3 ] is

• Scalar matrix

• identity matrix

• Diagonal matrix

• Null matrix

any matrix A is a symmetric matrix , if

• A = - A

• A = At

• A = -At

• A = A