1.

If A = (1, 8, 4) , B= (2, -3, 1) , then the direction cosines of a normal to the plane AOB is

Answer»

A`2/sqrt(78) , 5 /sqrt(78), (-7)/sqrt(78)`
B`(2sqrt(10))/9, (7sqrt(10))/90, (-19sqrt(10))/90`
C`4/sqrt(218) , 9 /sqrt(218), (-11)/sqrt(218)`
D`2/11, 6/11, (-9)/11`

ANSWER :B


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