શ્રેણિકના વ્યસ્તનું અસ્તિત્વ હોય, તો તે શોધો : $\left[\begin{array}{ccc}1 & 0 & 0 \\ 3 & 3 & 0 \\ 5 & 2 & -1\end{array}\right]$
  • A$\frac{1}{3}\left[\begin{array}{ccc}-3 & 0 & 0 \\ 3 & 1 & 0 \\ -9 & -2 & 3\end{array}\right]$
  • B$- \frac{1}{3}\left[\begin{array}{ccc}-3 & 0 & 0 \\ 3 & -1 & 0 \\ -9 & -2 & 3\end{array}\right]$
  • C$\frac{1}{3}\left[\begin{array}{ccc}-3 & 0 & 0 \\ -3 & -1 & 0 \\ -9 & -2 & -3\end{array}\right]$
  • D$\frac{1}{3}\left[\begin{array}{ccc}-3 & 0 & 0 \\ 3 & -1 & 0 \\ 9 & 2 & 3\end{array}\right]$
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Let $\mathrm{A}=\left[\begin{array}{ccc}1 & 0 & 0 \\ 3 & 3 & 0 \\ 5 & 2 & -1\end{array}\right]$

We have,

$|A|=1(-3-0)-0+0=-3$

Now,

$A_{11}=-3-0=-3, A_{12}=-(-3-0)=3, A_{13}=6-15=-9$

$A_{22}=-(0-0)=0, A_{22}=-1-0=-1, A_{22}=-(2-0)=-2$

$A_{31}=0-0=0, A_{32}=-(0-0)=0, A_{33}=3-0=3$

$\therefore a d j A=\left[\begin{array}{ccc}-3 & 0 & 0 \\ 3 & -1 & 0 \\ -9 & -2 & 3\end{array}\right]$

$\therefore A^{-1}=\frac{1}{|A|}$ $adjA = - \frac{1}{3}\left[\begin{array}{ccc}-3 & 0 & 0 \\ 3 & -1 & 0 \\ -9 & -2 & 3\end{array}\right]$

art

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