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3 and 4 .Determinants and Matrices
easy
નિશ્ચાયક $\Delta=\left|\begin{array}{lll}1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9\end{array}\right|$ ના ઘટક $6$ નો ઉપનિશ્ચાયક શોધો.
A
$-22$
B
$-16$
C
$6$
D
$-6$
Solution
since $6$ lies in the second row and third column, its minor $\mathrm{M}_{23}$ is given by
$\mathrm{M}_{23}=\left|\begin{array}{ll}1 & 2 \\ 7 & 8\end{array}\right|=8-14=-6$ (obtained by deleting $\mathrm{R}_{2}$ and $\mathrm{C}_{3}$ in $\Delta$ ).
Standard 12
Mathematics
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