3 and 4 .Determinants and Matrices
easy

आव्यूह $\left[\begin{array}{cc}-1 & 2 \\ 1 & -1\end{array}\right]$ पर केवल एक प्रारंभिक पंक्ति संक्रिया से निम्न में से कौनसा आव्यूह प्राप्त नहीं किया जा सकता है ?

A

$\left[\begin{array}{cc}0 & 1 \\ 1 & -1\end{array}\right]$

B

$\left[\begin{array}{cc}1 & -1 \\ -1 & 2\end{array}\right]$

C

$\left[\begin{array}{ll}-1 & 2 \\ -2 & 7\end{array}\right]$

D

$\left[\begin{array}{ll}-1 & 2 \\ -1 & 3\end{array}\right]$

(JEE MAIN-2022)

Solution

$A=\left[\begin{array}{cc}-1 & 2 \\1 & -1\end{array}\right]$

$R _{1} \rightarrow R _{1}+ R _{2} ;\left[\begin{array}{cc}0 & 1 \\ 1 & -1\end{array}\right]$ possible

$R _{1} \leftrightarrow R _{2} ;\left[\begin{array}{cc}1 & -1 \\ -1 & 2\end{array}\right]$ possible

Option is not possible

$R _{2} \rightarrow R _{2}+2 R _{1} ;\left[\begin{array}{rr}-1 & 2 \\ -1 & 3\end{array}\right]$ possible

Standard 12
Mathematics

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