Find a unit vector perpendicular to t...

Find a unit vector perpendicular to the plane determined by the points `(1,-1,2),(2,0,-1)a n d(0,2,1)dot`

`+-(1)/(sqrt(6))(2,1,1)`

`+-(1)/(sqrt(6))(1,2,1)`

`+-(1)/(6)(1,1,sqrt(2))`

none of these

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