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

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$A =$

$(\begin{array}{l} 4 & 3 & 1 \\ 2 & 3 & - 8 \\ 1 & 0 & - 4 \end{array})$ ,

$B =$

$(\begin{array}{l} 2 & 3 & 4 \\ 1 & 9 & 2 \\ - 7 & 1 & - 1 \end{array})$ and

$C =$

$(\begin{array}{l} 8 & 3 & 4 \\ 1 & - 2 & 3 \\ 2 & 4 & - 1 \end{array})$ then verify that

$A + (B + C) = (A + B) + C$ .

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9. Five marks exercise problem III