If `veca,vecb,vecc` are unit vectors such that veca is perpendicular to `vecb and vecc and |veca+

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If `veca,vecb,vecc` are unit vectors such that veca is perpendicular to `vecb and vecc and |veca+vecb+vecc|=1` then the angle between `vecb and vecc` is (A) `pi/2`` (B) `pi` (C) `0` (D) `(2pi)/3`
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