is a 7 × 7 matrix.

  is a 10 × 7 matrix.

Which one of the following matrix expressions is defined?

Consider the following four matrix expressions.
 

How many of these four matrix expressions are defined?

1. 0
2. 1
3. 2
4. 3
5. 4

and are positive whole numbers.

Matrix is of order

Matrix is of order

The matrix products and are both defined

A.  for no values of and

B.  when is equal to only

C.  when is greater than only

D.  when is less than only

E.  for all values of and

The order of the matrix is

A. 

B. 

C. 

D. 

E. 

If    and the matrix product   then the order matrix is

A.   

B.   

C.   

D.   

E.   

Let    and  

Using these matrices, the matrix product that is not defined is

A.   

B.   

C.   

D.   

E.