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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\'` will be perpendicular, if and only if: (A) `aa\'+cc\'=1=0` (B) `aa\'+bb\'+cc\'=1=0` (C) `aa\'+bb\'+cc\'=0` (D) `(a+a\')+(b+b\')+(c+c\')=0`

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