1.

A(-1, 2, 3), B(1, 1, 1) and C(2, -1, 3) are three points in the plane. The unit vector perpendicular to the plane ABC is …………..

Answer»

`+-((2hati+2hatj+hatk)/(3))`
`+-((2hati-2hatj+hatk)/(3))`
`+-((2hati-2hatj-hatk)/(3))`
`-((2hati+2hatj+hatk)/(3))`

ANSWER :A


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