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If $A = |\begin{matrix} 5 & 6 & 3 \\ - 4 & 3 & 2 \\ - 4 & - 7 & 3 \end{matrix}|$ , then cofactors of the elements of 2nd row are

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-39,27,11

-39,-3,11

-39,3,11

39, -3,11

answer is C.

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Detailed Solution

_{$C_{21} = {(- 1)}^{2 + 1} (18 + 21) = - 39$}

_{$C_{22} = {(- 1)}^{2 + 2} (15 + 12) = 27$}

_{$C_{23} = {(- 1)}^{2 + 3} (- 35 + 24) = 11$}

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