If $\begin{bmatrix} 2 & 4 \ 3 & 2 \end{bmatrix} \times P = \begin{bmatrix} 6 \ 8 \end{bmatrix}$, then the order of matrix P is:

1. 2 × 2

2. 2 × 1

3. 1 × 2

4. cannot be determined

If A = $\begin{bmatrix} 3 & -6 \end{bmatrix}$ and B = $\begin{bmatrix} 3 & -1 \ 4 & 3 \end{bmatrix}$, then the order of matrix AB is:

1. 1 × 2

2. 2 × 1

3. 2 × 2

4. 1 × 3

If $\begin{bmatrix} x & 1 \end{bmatrix} \begin{bmatrix} 1 & 0 \ -2 & 0 \end{bmatrix} = 0$, then the value of x is :

1. 0

2. 1

3. 2

4. -2

If matrix A = $\begin{bmatrix$}[r] -1 & 2 \end{bmatrix} and matrix B = $\begin{bmatrix$}[r] 3 \ 4 \end{bmatrix}, then matrix AB is equal to:

$1. \begin{bmatrix$}[r] -3 \end{bmatrix}

$2. \begin{bmatrix$}[r] 8 \end{bmatrix}

$3. \begin{bmatrix$}[r] 5 \end{bmatrix}

$4. \begin{bmatrix$}[r] -1 & 2 \ 3 & 4 \end{bmatrix}