1.

If the d.r'sof bar(OA),bar(OB) are (1,-2,3),(-3,4,5) then the d.c's of the normal to the plane bar(OAB) are

Answer»

`((4)/(SQRT(29)),(3)/(sqrt(29)),-(2)/(sqrt(29)))`
`((11)/(sqrt(171)),(7)/(sqrt(171)),(1)/(sqrt(171)))`
`((3)/(sqrt(29)),-(2)/(sqrt(29)),-(4)/(sqrt(29)))`
`((3)/(sqrt(29)),-(2)/(sqrt(29)),-(4)/(sqrt(29)))`

ANSWER :B


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