1.

For positive l, m and n, if the planes x = my + mz, y =1z+ nx, z=mx+ 1y intersect in a straight, line, then: 1, m and n satisfy the equation:

Answer»

`1 ^(2) + m^(2) + N^(2) =2`
` I ^(2) + m^(2) + n^(2) + 2ln =1`
`I ^(2) + m^(2) +n^(2) =1`
NONE of these

ANSWER :B


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