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If vec(a), vec(b), vec(c ) are three vec...

If `vec(a), vec(b), vec(c )` are three vectors such that `vec(a) + vec(b) + vec(c ) = 0` and `| vec(a) | =2, |vec(b) | =3, | vec(c ) = 5`, then the value of `vec(a). vec(b) + vec(b) . vec( c ) + vec(c ).vec(a)` is

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