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Let vec(a), vec(b), vec(c) be the position vectors of points A, B, C respectively. Under which one of the following conditions are the points A, B, C collinear? |
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Answer» `VEC(a)xxvec(b)=vec(0)` `(vec(a)xxvec(b))+(vec(b)xxvec(c))+(vec(c)xxvec(a))=vec(0)` |
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