Question

If $A=\left[\begin{array}{ccc}1& -2& 3\end{array}\right]$ and $B=\left[\begin{array}{c}2\\ -3\end{array}\right]$ then $A+B$ is:

• A. $\left[\begin{array}{ccc}0& 0& 0\end{array}\right]$
• B. $\left[\begin{array}{c}0\\ 0\end{array}\right]$
• C. $\left[\begin{array}{cc}1& -4\end{array}\right]$
• D. Not defined

Answer 1

Answer: (D)

Not defined

$A+B$ is not defined.

Because $A$ and $B$ are not in the same order.

Order of $A=1\times 3$ and Order of $B=2\times 1$