1.

The straight lines whose direciton cosines are given by al + bm + cn = 0 , fmn + gnl + hlm = 0 if ............

Answer»

`f/a + G/b + h/c = 0`
`(a^2)/(f) + (b^2)/(g) + (c^2)/(h) = 0`
`a^2(g + h) + b^2(h+g) + c^2(f + g)=0`
NONE of these

Answer :A


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