A) \[AB=AC\] does not imply \[B=C\]
B) \[A+B=B+A\]
C) \[(AB)=BA\]
D) \[AB=0\] implies \[A=0\] or \[B=0\]
Correct Answer: A
Solution :
As [b], [c], [d] are always true but [a] show \[AB=AC\,\,\,\,\,\Rightarrow \,\,\,\,\,\left\{ \begin{align} & B=C \\ & B\ne C \\ \end{align} \right\}\]
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