Practicing Success
In ΔABC (A) $\vec{AB}+\vec{BC}+\vec{CA}=\vec{O}$ |
(A), (B), (D) only (A), (B), (E) only (B), (E) only (A), (D), (E) only |
(A), (B), (D) only |
in given triangle $\vec{A B}+\vec{B C}=\vec{A C}$ by triangular of vector addition. so $\vec{A B}+\vec{B C}-\vec{A C}=\vec{0}$ ⇒ $\vec{A B}+\vec{B C}+\vec{C A}=\vec{0}$ as $\vec{A C}= -\vec{C A}$ ⇒ $\vec{A B}-\vec{C B}+\vec{C A}=\vec{0}$ as $\vec{B C}= -\vec{C B}$ |