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If $P=\begin{bmatrix}1&1\\2&2\end{bmatrix}, Q=\begin{bmatrix}2&1\\2&2\end{bmatrix}$ and $R=\begin{bmatrix}3&0\\1&3\end{bmatrix}$, which one of the following statements is $TRUE$?

  1. $PQ=PR$
  2. $QR= RP$
  3. $OP=RP$
  4. $PO= OR$
in Linear Algebra retagged by
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