question_answer

The position vectors of A and B are \[\mathbf{i}-\mathbf{j}+2\mathbf{k}\] and \[3\mathbf{i}-\mathbf{j}+3\mathbf{k}.\] The position vector of the middle point of the line AB is                                                                                                        [MP PET 1988]

A) \[\frac{1}{2}\mathbf{i}-\frac{1}{2}\mathbf{j}+\mathbf{k}\]       

B) \[2\mathbf{i}-\mathbf{j}+\frac{5}{2}\mathbf{k}\]

C) \[\frac{3}{2}\mathbf{i}-\frac{1}{2}\mathbf{j}+\frac{3}{2}\mathbf{k}\]    

D) None of these