Question

(10

Answer 1

Answer:

2 by 1

Step-by-step explanation:

2 by 1

Answer 2

Given:

The matrix multiplication

$\begin{bmatrix}4&5&6\\1&2&3\end{bmatrix}\begin{bmatrix}10\\20\\30\end{bmatrix}$

To find:

The order of resulting matrix.

Solution:

We know that, if order of first matrix is $m_1\times n_1$ and the order of second matrix is $m_2\times n_2$, then the order of these two matrices is $m_1\times n_2$.

We have,

$\begin{bmatrix}4&5&6\\1&2&3\end{bmatrix}\begin{bmatrix}10\\20\\30\end{bmatrix}$

Here, the order of first matrix is $2\times 3$ and the order of the second matrix is $3\times 1$. So, the order of the second matrix is $2\times 1$. It is also written are 2 by 1.

Therefore, the correct option is A.