Chapter 6, Problem 21E

To determine

To check:

Whether the matrix $A=\left[\begin{array}{ccc}1& 2& 3\\ 0& 4& 6\\ 0& 0& 0\end{array}\right]$ and $B=\left[\begin{array}{ccc}1& 2& 3\\ 0& 4& 6\end{array}\right]$ are equal or not.