Lines OA and OB are drawn from O with di...

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)

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