Straight lines OA and OB are drawn from the origin O, if the direction ratios of the lines OA and OB are 1, -1, -1 and 2, -1, 1 respectively then find the direction cosines of the normal to the plane AOB.

Direction ratios of the line are 2, 1, -3 . Find the direction cosines.

Three lines are drawn from the origin O with direction ratio proportional to 1,-1,1,2,-3,0 and 1,0,3. The three lines are

Lines bar(OA),bar(OB) are drawn from O with direction cosines proportional to (1,-2,-1), (3,-2,3). Find the direction cosines of the normal to the plane AOB.

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)

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)

Lines OA,OB are drown from O with direction cosines proportinal to 1,-2,-1;3-2,3. Find the direction cosines of the normal to the plane AOB .

Prove that 1,1,1 cannot be direction cosines of a straight line.