The product of any matrix by the scalar ......... Is the null matrix.

Explanation

To solve the question, "The product of any matrix by the scalar ......... is the null matrix," we need to understand the concept of scalar multiplication of matrices and the definition of a null matrix.

### Step-by-Step Solution:

1. **Understanding the Null Matrix**:
- A null matrix (also known as a zero matrix) is a matrix in which all the elements are zero. For example, a 2x2 null matrix is represented as:
\[
\begin{pmatrix}
...