If a, b, c are three non-zero vectors such that a+b+c= 0 and m=a·b+b.c+ c·a, then (A) m < 0 (C) m = 0 (D) m = 3 (B)m>0
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7g gu 6f 6f 6f 7tv7tv7tv7tv7tv7tvt7
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vugv6tv7tv6tv6tv7tv6tv6tv6gvf6v6fv6tv6tvrdrdoeoekekkdke
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