$\overrightarrow A \, = \,2\widehat i\, + \,3\widehat j + 4\widehat k$ , $\overrightarrow B \, = \widehat {\,i} - \widehat j + \widehat k$, then find their substraction by algebric method.
If a particle moves from point $P (2,3,5)$ to point $Q (3,4,5)$. Its displacement vector be
If $\vec{P}+\vec{Q}=\vec{P}-\vec{Q}$, then