1.

For positive l, m and n, if the points x=ny+mz, y=lz+nx, z=mx+ly intersect in a straight line, when Q. l, m and n satisgythe equation

Answer»

`l^2+m^2+n^2=2`
`l^2+m^2+n^2+2mln=1`
`l^2+m^2+n^2=1`
NONE of these

Answer :(B)


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