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Relations And Functions

Question

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If $∆ = |\begin{matrix} 5 & 3 & 8 \\ 2 & 0 & 1 \\ 1 & 2 & 3 \end{matrix}|$ , white the cofactor of the element a₃₂.

Solution

$Minor of the element a_{32} = |\begin{matrix} 5 & 8 \\ 2 & 1 \end{matrix}|$

= 5 - 16

= - 11

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