The direction ratios of the lines OA and OB are 1, –2, –1 and 3, –2, 3. Then the direction cosines of the normal o

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Q 2147112083.     The direction ratios of the lines OA and OB are 1, –2, –1 and 3, –2, 3. Then the direction cosines of the normal of plane AOB where O is the origin, are
A

(4/sqrt(29) , 3/sqrt(29) , -2/sqrt(29))

B

(2/sqrt(29) , 3/sqrt(29) , 4/sqrt(29))

C

(-4/sqrt(29) , 2/sqrt(29) , 3/sqrt(29))

D

(4/sqrt(29) , 2/sqrt(29) , -3/sqrt(29))

#### HINT

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