If \[\vec{a},\text{ }\vec{b}\] and \[\vec{c}\] are the position vectors of the vertices of an equilateral triangle whose orthocentre is at the origin, then which one of the following is correct?

\[\vec{a}+\vec{b}+\vec{c}=\,\,unit\,\,vector\]

\[\vec{a}+\vec{b}+\vec{c}=\vec{0}\]

If \[\vec{a},\text{ }\vec{b}\] and \[\vec{c}\] are the position vector

1.	If \[\vec{a},\text{ }\vec{b}\] and \[\vec{c}\] are the position vectors of the vertices of an equilateral triangle whose orthocentre is at the origin, then which one of the following is correct?
A.	\[\vec{a}+\vec{b}+\vec{c}=\vec{0}\]
B.	\[\vec{a}+\vec{b}+\vec{c}=\,\,unit\,\,vector\]
C.	\[\vec{a}+\vec{b}=\vec{c}\]
D.	\[\vec{a}=\vec{b}+\vec{c}\]
Answer» B. \[\vec{a}+\vec{b}+\vec{c}=\,\,unit\,\,vector\]

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If \[\vec{a},\text{ }\vec{b}\] and \[\vec{c}\] are the position vectors of the vertices of an equilateral triangle whose orthocentre is at the origin, then which one of the following is correct?

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