A unit vector perpendicular to vector c and coplanar with vectors a an

1.	A unit vector perpendicular to vector c and coplanar with vectors a and b is [MP PET 1999]
A.	\[\frac{\mathbf{a}\times (\mathbf{b}\times \mathbf{c})}{\|\mathbf{a}\times (\mathbf{b}\times \mathbf{c})\|}\]
B.	\[\frac{\mathbf{b}\times (\mathbf{c}\times \mathbf{a})}{\|\mathbf{b}\times (\mathbf{c}\times \mathbf{a})\|}\]
C.	\[\frac{\mathbf{c}\times (\mathbf{a}\times \mathbf{b})}{\|\mathbf{c}\times (\mathbf{a}\times \mathbf{b})\|}\]
D.	None of these
Answer» D. None of these

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A unit vector perpendicular to vector c and coplanar with vectors a and b is [MP PET 1999]

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