Matrix multiplication on 2 × 3 — task. Mathematics State Board, Class 10.

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Find

$AB$ if

$A =\begin{bmatrix} 6 & 10 & 2\\ 10 & 2 & 3\\ \end{bmatrix}, B = \begin{bmatrix} 7 & -2 & 3\\ 11 & 4 & 1\\ -1 & -7 & 8 \end{bmatrix}$

$AB$ matrix is

$[\begin{array}{l} i & i & i \\ i & i & i \end{array}]$

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