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Find a unit vector pependicular to the p...

Find a unit vector pependicular to the plane determined by the points (1,-1,2), (2,0,-1) and ( 0,2,1) .

A

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

B

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

C

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

D

none of these

Text Solution

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The correct Answer is:
A
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