Five marks example problem I — task. Mathematics State Board, Class 10.

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$A =$

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

$B =$

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

$C =$

$(\begin{array}{l} 1 & 2 \\ 2 & - 1 \end{array})$ , show that

$(AB)C = A(BC)$ .

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12. Five marks example problem I