Assuming that the sums and products given below are defined which of the following is not true ...........

Assuming that the sums and products given below are defined which of the following is not true for matrices

AB =AC does not imply B=C

A+B =B+A

(AB)' =B'A'

AB =O $\Rightarrow$ A=O or B =O

AB =AC does not imply B=C

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