C-12-Q019mediumsingle_mcqIf AB⃗=u⃗\vec{AB}=\vec{u}AB=u and BC⃗=v⃗\vec{BC}=\vec{v}BC=v, then u⃗+v⃗=\vec{u}+\vec{v}=u+v=aAB⃗\vec{AB}ABbBC⃗\vec{BC}