A) A.P.
B) G.P.
C) H.P.
D) none of these
Correct Answer: C
Solution :
Given lines will be concurrent if \[\left| \begin{matrix} 1 & 2a & a \\ 1 & 3b & b \\ 1 & 4c & c \\ \end{matrix} \right|=0\Rightarrow -bc+2ca-ab=0\]\[\Rightarrow \]\[b=\frac{2ca}{c+a}\]\[\Rightarrow \]\[a,b,c\]are in H.P.You need to login to perform this action.
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