1.

A unit vector perpendicular to the plane determined by the points P(1, -1, 2) Q (2, 0, -1) and R (0, 2, 1) is

Answer»

`(2I + J + K)/(sqrt(6))`
`(2i + j + k)/(3)`
`(2i - j - k)/(sqrt(3))`
`(2i - j - k)/(3)`

Answer :A


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