defence exam Army Havildar SAC Mock Test Series 2025 Mathematics Matrices Operations on Matrices

यदि \(\mathrm{A}=\left[\begin{array}{cc}2 & 4 \\ x & \frac{-1}{2}\end{array}\right]\) और A एक अव्युत्क्रमणीय आव्यूह है, तो x का मान होगा:

1
\(\frac{1}{4}\)
2
\(-\frac{1}{4}\)
3
-7
4
32
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