1.

If planes ax+by+cz+d=0 and a'x+b'y+c'z+d'=0 are perpendicular, then

Answer»

`aa'+bb'+cc'+dd'=0`
`aa'+bb'+cc'=0`
`(a)/(a')=(B)/(b')=(C )/(c')`
`(a)/(a')+(b)/(b')+(c )/(c')=0`

ANSWER :B


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