Question

What are the dimensions of the matrix?

[ 6 ]
[ 2 ]
[ 8 ]


A. 3 x 1
B. 3 x 3
C. 4 x 1
D. 1 x 3

Answer 1

Answer: 3 x 1

There are 3 rows and 1 column. We write the number of rows first. The rows are laid out horizontally while the columns are vertical. We say this is a "3 by 1 matrix".

Answer 2

For this case we have that by definition, the dimension of a matrix is given by:

The number of rows by the number of columns

It is observed that we have a column that consists of three rows.

`\left[\begin{array}{c}6&\\2&\\8&\end{array}\right]`

Thus, the dimension of the matrix is 3 * 1

Answer:

3 * 1

Option A