If a, b and c are unit coplanar vectors, then the scalar triple product [2 a – b, 2 b – c, 2 c – a]

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If a, b and c are unit coplanar vectors, then the scalar triple product [2 a – b, 2 b – c, 2 c – a] will be equal to
(a) 0 (b) 1 (c) -√3 (d) √3

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