The equation of a line passing through the point a→ parallel to the plane r→⋅n→=q and perpendicular to the line r→=b→+tc→ is
r→=a→+λ(n→×c→)
(r→−a→)×(n→×c→)=0
r→=b→+λ(n→×c→)
none of these
Required line is parallel to n→×c→
The equation of a line r→=a→+λ(n→×c→)
(r→−a→)=λ(n→×c→)
∴ (r→−a→)×(n→×c→)=0