MCQ
The position vector of a point $R$ which divides the line joining two points P and Q whose position vectors are $\hat{i}+2\hat{j}- \hat{k}$ and -$\hat{i}+\hat{j}- \hat{k}$ respectively, in the ratio $2: 1$ externally is
- A$-3 \hat{i}-\hat{k}$
- B$3 \hat{i}+\hat{k}$
- C$2 \hat{i}+\hat{j}-\hat{k}$
- DNone of these