The problem asks to determine the number of rows in the given matrix $B$. The matrix $B$ is defined as: $B = \begin{bmatrix} 1 & 1 & 3 & 0 \\ 4 & 2 & 1 & 1 \\ 3 & 2 & 0 & 1 \end{bmatrix}$

1. Problem Description

The problem asks to determine the number of rows in the given matrix $B$. The matrix $B$ is defined as:

$B = \begin{bmatrix} 1 & 1 & 3 & 0 \\ 4 & 2 & 1 & 1 \\ 3 & 2 & 0 & 1 \end{bmatrix}$

2. Solution Steps

The number of rows in a matrix is the number of horizontal lines of elements. In the matrix $B$, we can identify the rows as follows:

Row 1: $1, 1, 3, 0$

Row 2: $4, 2, 1, 1$

Row 3: $3, 2, 0, 1$

Therefore, matrix $B$ has 3 rows.

3. Final Answer

3