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If veca+2vecb+3vecc, 2veca+8vecb+3vecc, ...

If `veca+2vecb+3vecc, 2veca+8vecb+3vecc, 2veca+5vecb-vecc and veca-vecb-vecc` be the positions vectors A,B,C and D respectively, prove that `vec(AB) and vec(CD)` are parallel. Is ABCD a parallelogram?

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