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. cose^(-1)(l)+cos^(-1)(m)+cos^(-1)(n) is equal to

Answer»

`90^(@)`
`50^(@)`
`180^(@)`
NONE of these

Answer :(c)


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