![If\ \vec{a}\times\vec{b}=\vec{b}\times\vec{c}=\vec{c}\times\vec{a}\ then\ \vec{a}+\vec{b}+\vec{c}= If\ \vec{a}\times\vec{b}=\vec{b}\times\vec{c}=\vec{c}\times\vec{a}\ then\ \vec{a}+\vec{b}+\vec{c}=](https://tex.z-dn.net/?f=If%5C+%5Cvec%7Ba%7D%5Ctimes%5Cvec%7Bb%7D%3D%5Cvec%7Bb%7D%5Ctimes%5Cvec%7Bc%7D%3D%5Cvec%7Bc%7D%5Ctimes%5Cvec%7Ba%7D%5C+then%5C+%5Cvec%7Ba%7D%2B%5Cvec%7Bb%7D%2B%5Cvec%7Bc%7D%3D)
(a) abc
(b) –1
(c) 0
(d) 2
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