A) 5
B) 25
C) 125
D) 0
Correct Answer: B
Solution :
Required determinant \[|adj\,A|\]=\[|A{{|}^{3-1}}\],\[\,\text{where}A=\left| \,\begin{matrix} {{a}_{1}} & {{b}_{1}} & {{c}_{1}} \\ {{a}_{2}} & {{b}_{2}} & {{c}_{2}} \\ {{a}_{3}} & {{b}_{3}} & {{c}_{3}} \\ \end{matrix}\, \right|\] \[={{5}^{2}}=25,\] \[(\because \,\,|adj\,A|=|a{{|}^{n-1}})\]You need to login to perform this action.
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