Question

If $A=\left[a_{ij}\right]$ is a matrix of order $4\times 5$, then the diagonal elements of $A$ are

• A. $a_{11},a_{22},a_{33},a_{44}$
• B. $a_{55},a_{44},a_{33},a_{22},a_{11}$
• C. $a_{11},a_{22},a_{33}$
• D. Do not exist

Answer 1

Answer: (D)

The given matrix $A=\left[a_{ij}\right]$ is a matrix of order $4\times 5$, which is not a square matrix.
$\therefore$ The diagonal elements of $A$ do not exist.