Question
यदि आव्यूह $\left[ {\begin{array}{*{20}{c}}1&3&{\lambda + 2}\\2&4&8\\3&5&{10}\end{array}} \right]$ अव्युत्क्रमणीय है, तब $\lambda = $
यदि $\,\left| {\,\begin{array}{*{20}{c}}1&3&{\lambda + 2}\\2&4&8\\3&5&{10}\end{array}\,} \right| = 0$
$\Rightarrow$ $1(40 - 40) - 3(20 - 24) + (\lambda + 2)(10 - 12) = 0$
$\Rightarrow$ $2(\lambda + 2) = 12 \Rightarrow \lambda = 4.$
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