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If the d.r's of bar(OA),bar(OB) are (1,...

If the d.r's of `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

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The correct Answer is:
`((25)/(sqrt(714)),(8)/(sqrt(714)),(5)/(sqrt(714))),((11)/(sqrt(1050)),-(20)/(sqrt(1050)),-(23)/(sqrt(1050)))`
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