Let P(2,−1,4), Q(6,3,−2) and R(−1,5,1) be three points in space. Answer the following:
(i) Find the vectors PQ and PR in component form.
(ii) Determine the vector that must be added to PQ so that the sum equals PR.
(iii) By drawing a neat sketch of triangle PQR with the vectors placed tail-to-head, verify graphically the relation obtained in part (ii).