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CBSE Class 12 Math 2012 Solved Paper

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Question : 10 of 29
Marks: +1, -0
If Δ = ∣538201123∣\begin{vmatrix} 5 & 3 & 8 \\ 2 & 0 & 1 \\ 1 & 2 & 3 \end{vmatrix} , white the cofactor of the element a32a_{32}.
Solution:  
Minor of the element a32a_{32} = ∣5821∣\begin{vmatrix} 5 & 8 \\ 2 & 1 \end{vmatrix}
= 5 - 16 = - 11
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