If a, b, c are mutually perpendicular vectors of equal magnitudes, then the angle between the vectors a and \[\mathbf{a}+\mathbf{b}+\mathbf{c}\] is

\[{{\cos }^{-1}}\frac{1}{\sqrt{3}}\]

If a, b, c are mutually perpendicular vectors of equal magnitudes, the

1.	If a, b, c are mutually perpendicular vectors of equal magnitudes, then the angle between the vectors a and \[\mathbf{a}+\mathbf{b}+\mathbf{c}\] is
A.	\[\frac{\pi }{3}\]
B.	\[\frac{\pi }{6}\]
C.	\[{{\cos }^{-1}}\frac{1}{\sqrt{3}}\]
D.	\[\frac{\pi }{2}\]
Answer» D. \[\frac{\pi }{2}\]

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If a, b, c are mutually perpendicular vectors of equal magnitudes, then the angle between the vectors a and \[\mathbf{a}+\mathbf{b}+\mathbf{c}\] is

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