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3 and 4 .Determinants and Matrices
easy
શ્રેણિક $A=\left[\begin{array}{ll}1 & 5 \\ 6 & 7\end{array}\right],$ માટે, ચકાસો કે $(A-A^{\prime})$ વિસંમિત શ્રેણિક છે.
Option A
Option B
Option C
Option D
Solution
$A-A^{\prime}=\left[\begin{array}{ll}1 & 5 \\ 6 & 7\end{array}\right]-\left[\begin{array}{ll}1 & 6 \\ 5 & 7\end{array}\right]=\left[\begin{array}{ll}0 & -1 \\ 1 & 0\end{array}\right]$
$\left(A-A^{\prime}\right)^{\prime}=\left[\begin{array}{cc}0 & 1 \\ -1 & 0\end{array}\right]=-\left[\begin{array}{cc}0 & -1 \\ 1 & 0\end{array}\right]=-\left(A-A^{\prime}\right)$
Hence, $\left(A-A^{\prime}\right)$ is a skew-symmetric matrix.
Standard 12
Mathematics