Question
यदि $A =\left[\begin{array}{ccc}3 & -1 & 2 \\ 2 & 1 & 3 \\ 1 & -3 & K\end{array}\right]$ एक अव्युत्क्रमणीय आव्यूह हो, तो K का मान होगा-

Answer

(B) $-2$
एक अव्युत्क्रमणीय आव्यूह के लिए
$| A |=0 \therefore\left|\begin{array}{ccc}3 & -1 & 2 \\ 2 & 1 & 3 \\ 1 & -3 & K\end{array}\right|=0$
$3(K+9)+1(2 K-3)+2(-6-1)=0$
$\Rightarrow 3 K+27+2 K-3-14=0$
$\Rightarrow 5 K+10=0 \Rightarrow K=-2$
अतः सही विकल्प (B) है।

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free