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

  • A
    $A + B = B + A$
  • B
    $AB = AC$ does not imply $B = C$
  • C
    $AB = O$ implies $A = O$ or $B = O$
  • D
    $(AB)' = B'A'$

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