Practicing Success
If $A=\begin{bmatrix} 1 & 2\\3 & 4\end{bmatrix}, B=\begin{bmatrix}a & 0\\0 & b \end{bmatrix}; a, b \in N, $ then |
There can't exist any B such that AB =BA There exist more than one B, but finite in number when AB = BA There exists exactly one B, when AB =BA There exist infinite B, when AB =BA |
There exist infinite B, when AB =BA |