3 and 4 .Determinants and Matrices
easy

જો $A = \left| {\,\begin{array}{*{20}{c}}5&6&3\\{ - 4}&3&2\\{ - 4}&{ - 7}&3\end{array}\,} \right|\,,$ તો બીજી હારના ઘટકોના સહઅવયવ મેળવો.

A

$39,\, - 3,\,11$

B

$ - 39,\,3,\,11$

C

$ - 39,\,27,\,11$

D

$ - 39,\, - 3,\,11$

Solution

(c) ${C_{21}} = {( – 1)^{2 + 1}}(18 + 21) = – 39$

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

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

Standard 12
Mathematics

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