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veca,vecb,vecc are 3 vectors, such that...

`veca,vecb,vecc` are 3 vectors, such that `veca+vecb+vecc=0, |veca|=1,|vecb|=2,|vecc|=3, then veca.vecb+vecb.vecc+vecc.veca` is equal to (A) 0 (B) -7 (C) 7 (D) 1

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