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The two lines x=ay+b, z=cy+d and x=a'y+b...

The two lines `x=ay+b, z=cy+d and x=a'y+b', z=c'y+d'` are perpendicular to each other, if

A

`aa'+c c'=1`

B

`aa'+c c'=-1`

C

`ac+a'c'=1`

D

`ac+a'c'=-1`

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The correct Answer is:
B
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