A) is singleton
B) Contains exactly two numbers only one of which is positive
C) Contains exactly two positive numbers
D) is empty
Correct Answer: D
Solution :
\[\left| \begin{matrix} \alpha & 1 & 3 \\ 2 & 1 & -4 \\ \alpha & -2 & 3 \\ \end{matrix} \right|=0\]\[\Rightarrow 3{{\alpha }^{2}}+18=0\]\[\Rightarrow \alpha \in \phi \]You need to login to perform this action.
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