A) 4
B) 6
C) 0
D) 8
Correct Answer: A
Solution :
\[\left| \,\begin{matrix} 2 & 5/2 & 3 \\ 5/2 & 3 & 7/2 \\ 3 & 7/2 & k \\ \end{matrix}\, \right|=0\] Þ \[\left| \,\begin{matrix} 4 & 5 & 6 \\ 5 & 6 & 7 \\ 6 & 7 & 2k \\ \end{matrix}\, \right|=0\] Þ \[4(12k-49)-5(10k-42)+6(35-36)=0\] Þ \[48k-196-50k+210+210-216=0\] Þ \[k=4\].You need to login to perform this action.
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