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Matrix elements
Timed Test
$A=\left[\begin{array}{rr}12 & 14 & -3 & 6 \\2 & 18 & -10 &12 \\1 &-9 &40 & -2 \\3 &3 &6 & 1\end{array}\right]$ **$A_{2,4}=$** [[☃ numeric-input 1]]
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