If a, b, c are any three coplanar unit vectors, then

1.	If a, b, c are any three coplanar unit vectors, then
A.	\[\mathbf{a}\,.\,(\mathbf{b}\times \mathbf{c})=1\]
B.	\[\mathbf{a}\,.\,(\mathbf{b}\times \mathbf{c})=3\]
C.	\[(\mathbf{a}\times \mathbf{b})\,.\,\mathbf{c}=0\]
D.	\[(\mathbf{c}\times \mathbf{a})\,.\,\mathbf{b}=1\]
Answer» D. \[(\mathbf{c}\times \mathbf{a})\,.\,\mathbf{b}=1\]

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If a, b, c are any three coplanar unit vectors, then

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