Question

If A = $\begin{bmatrix} 2 & 1 \\\[0.3em] 1 & 4 \\\[0.3em] -1 & 6 \\\[0.3em] 0&7 \end{bmatrix}$ and B= $\begin{bmatrix} 1 & 2&3&0 \\\[0.3em] 2 & -1 & 6&7\end{bmatrix}$ then

• A. only AB is defined
• B. only BA is defined.
• C. AB and BA both are defined.
• D. Neither AB nor BA is defined.

Answer 1

Answer: (C)

AB and BA both are defined.

Answer 2

The correct option is(C):AB and BA both are defined.