If a, b and c are mutually perpendicular...

If a, b and c are mutually perpendicular vectors of the same magnitude, then the cosine of the angle between a and a +b+c is

A

`(1)/(sqrt(2))`

B

`(1)/(sqrt(3))`

C

`(1)/(2)`

D

`(sqrt(3))/(2)`

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The correct Answer is:

B

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