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JEE MATHEMATICS MCQ: PAIR OF STRAIGHT LINES

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The three lines lx+my+n=0,mx+ny+l=0,nx+ly+m=0l x+m y+n=0, m x+n y+l=0, n x+l y+m=0 are concurrent if
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Correct option: D
l+m+n=0l+m+n=0
Option D (l+m+n=0) is correct because the determinant of the coefficients of the concurrent lines must be zero, which simplifies to l+m+n=0.

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