Five marks exercise problem III — task. Mathematics State Board, Class 10.

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Show that the matrices

$A =$

$(\begin{array}{l} 1 & 2 \\ 3 & 1 \end{array})$ ,

$B =$

$(\begin{array}{l} 1 & - 2 \\ - 3 & 1 \end{array})$ satisfy commutative property

$AB = BA$ .

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17. Five marks exercise problem III