$A=\left[\begin{array}{rr}6 & 13 & -7 & 9
\\3 & 3 & 1 & 4
\\6 & 2 &-8 & 19
\\2 &6 &8 & 9\end{array}\right]$
**$A_{4,1}=$** [[☃ numeric-input 1]]
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