Question
आव्यूह $A = \left( {\begin{array}{*{20}{c}}a&2\\2&4\end{array}} \right)$अव्युत्क्रमणीय होगा, यदि
अत:, $a = 1$ के लिये $A$ एक अव्युत्क्रमणीय आव्यूह है।
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