Question

Which of the following is a row matrix?

• A. $\left[\begin{array}{cc}1& 2\end{array}\right]$
• B. $\left[\begin{array}{ccc}1& 0& 0\\ 0& 1& 0\\ 0& 0& 1\end{array}\right]$
• C. $\left[\begin{array}{c}5\\ 5\\ 5\end{array}\right]$
• D. $\left[\begin{array}{cc}5& 1\\ 1& 5\end{array}\right]$

Answer 1

The correct option is A

$\left[\begin{array}{cc}1& 2\end{array}\right]$

You know that a row matrix is simply a matrix with just one row. It can have any number of columns i.e., If order is m x n, m = 1 for a row matrix. Also note that option (c) is not a row matrix since its having more than one rows although with one single column.