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If triangle ABC (Fig 10.18), which of the following is not true : (A) vec(AB)+vec(BC)+vec(CA)=vec(0) (B) vec(AB)+vec(BC)-vec(AC)=vec(0) ( C ) vec(AB)+vec(BC)-vec(CA)=vec(0) (D) vec(AB)-vec(CB)+vec(CA)=vec(0) |
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