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If $\hat i -3 \hat j +\hat k$ and $\lambda \hat i+ 3 \hat j$ are coplanar, then $ \lambda$ is equal to :

\[\begin {array} {1 1} (a)\;-1 & \quad (b)\;\frac{1}{2}\\ (c)\;\frac{-3}{2} & \quad (d)\;2\end {array}\]
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1 Answer

$ (c)\;\frac{-3}{2}$
answered Nov 7, 2013 by pady_1
 

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