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Questions  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class11  >>  3-D Geometry
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Q)

The two lines whose equations are given by $x=ay+b,\:\:z=cy+d\:\:\:and\:\:\:x=a'y+b',\:\:z=c'y+d'$ are $\perp$ if

$\begin{array}{1 1} (a)\:\:aa'+bb'+cc'=0\:\:\:\qquad\:\:(b)\:\:aa'+cc'+1=0\:\:\:\qquad\:\:(c)\:\:aa'+bb'+cc'=1\:\:\:\qquad\:\:(d)\:\:aa'+bb'+cc'=-1 \end{array} $

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