A) All a
B) \[a=4\]only
C) \[-1\le a\le 3\]
D) \[a>0\]only
Correct Answer: A
Solution :
Given lines are concurrent, if \[\left| \,\begin{matrix} 2 & 1 & -1 \\ a & 3 & -3 \\ 3 & 2 & -2 \\ \end{matrix}\, \right|=0\,\,\]. This is true for all values of a because\[{{C}_{2}}\]and \[{{C}_{3}}\]are identical.
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