Straight Line Question 52
Question: The three lines $ lx+my+n=0 $ , $ mx+ny+l=0 $ , $ nx+ly+m=0 $ are concurrent if [Pb. CET 2002]
Options:
A) $ l=m+n $
B) $ m=l+n $
C) $ n=l+m $
D) $ l+m+n=0 $
Correct Answer: D
Show Answer
Answer:
Solution:
Þ $ (l+m+n)| \begin{matrix} 1 & m & n \\ 1 & n & l \\ 1 & l & m \\ \end{matrix} |=0\Rightarrow (l+m+n)=0 $ .
BETA
