Lines OA and OB are drawn from O with directioncosines proportional to (1,-2,-1) and (3,-2,3)
Channel: Doubtnut
Date: 2020-04-12

Lines OA and OB are drawn from O with directioncosines proportional to (1,-2,-1) and (3,-2,3) respectively. The direction ratios of the normal to the planes AOB are (A) (4,3,2) (B) (4,-3,-2) (C) (-4,3,-2) (D) (4,3,-2)