Q 1123067841.     If three unit vectors `veca,vecb,vecc` satisfy the condition `veca+vecb+vecc = vec0,`then the angle between `veca and vecb` is :

EAMCET 2010
A

`(2\pi)/3`

B

`(5\pi)/6`

C

` (\pi)/3`

D

`\pi/6`

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