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The direction ratio's of two lines $AB,AC$ are $1,-1,-1$ and $2,-1,1.$ The direction ratios of the normal to the plane $ABC$ are

\[(a)\;2,3,-1 \quad (b)\;2,2,1 \quad (c)\;3,2,-1 \quad (d)\;-1,2,3 \]
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(a) 2,3,-1
answered Nov 7, 2013 by pady_1

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