st-line

Question: The three lines $lx+my+n=0$, $mx+ny+l=0$, $nx+ly+m=0$ are concurrent if



1) $l=m+n$
2) $m=l+n$
3) $n=l+m$
4) $l+m+n=0$
Solution: Explanation: No Explanation
Concurrency of three lines

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