• # question_answer The position vector of a point lying on the line joining the points whose position vectors are $\hat{i}+\hat{j}-\hat{k}$and $\hat{i}-\hat{j}+\hat{k}$is A)  $\hat{j}$                              B)         $\hat{i}$ C)  $\hat{k}$                             D)         $\vec{o}$

The position vector of mid point of line joining the points whose position vectors are $\hat{i}+\hat{j}-\hat{k}$and $\hat{i}-\hat{j}+\hat{k}$ $=\frac{\hat{i}+\hat{j}-\hat{k}+\hat{i}-\hat{j}+\hat{k}}{2}=\frac{2\hat{i}}{2}=\hat{i}$