JEE Advance - Mathematics (1994 - No. 10)
A unit vector perpendicular to the plane determined by the points $$P\left( {1, - 1,2} \right)Q\left( {2,0, - 1} \right)$$ and $$R\left( {0,2,1} \right)$$ is ............
$$ {{2\widehat i + \widehat j + \widehat k} \over {\sqrt 6 }} $$
$$ -{{2\widehat i + \widehat j + \widehat k} \over {\sqrt 6 }} $$
$$ {{2\widehat i - \widehat j + \widehat k} \over {\sqrt 6 }} $$
$$ {{2\widehat i + \widehat j - \widehat k} \over {\sqrt 6 }} $$
$$ {{ -2\widehat i - \widehat j - \widehat k} \over {\sqrt 6 }} $$
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