The total number of elements in an m × n matrix is:

1. m + n

2. mⁿ

3. mn

4. 2^{m + n}

The matrix, A = $\begin{bmatrix} 3 & 4 & -8 \ 2 & 0 & -2 \ 1 & 7 & -9 \end{bmatrix}$, then the value of a₂₃ is:

1. 2

2. -8

3. -9

4. -2

A matrix of order of 3 × 1 whose elements a_ij are given by a_ij = (2i + j), is :

1. $\begin{bmatrix} 3 & 5 & 7 \end{bmatrix}$

2. $\begin{bmatrix} 3 \ 5 \ 7 \end{bmatrix}$

3. $\begin{bmatrix} 2 & 4 & 6 \end{bmatrix}$

4. $\begin{bmatrix} 2 \ 4 \ 6 \end{bmatrix}$

A matrix of order 3 × 2 whose elements a_ij are given by a_ij = (i + j), is:

1. $\begin{bmatrix} 2 & 3 & 4 \ 3 & 4 & 5 \end{bmatrix}$

2. $\begin{bmatrix} 2 & 3 & 4 \ 4 & 5 & 6 \end{bmatrix}$

3. $\begin{bmatrix} 2 & 3 \ 3 & 4 \ 4 & 5 \end{bmatrix}$

4. $\begin{bmatrix} 2 & 3 \ 3 & 4 \ 5 & 6 \end{bmatrix}$