Solution Since the vector is to be directed from P to Q, clearly P is the initial point
and Q is the terminal point So, the required vector joining P and Q is the vector PQ
uuur ,
given by
PQ
uuur  =
ˆ
ˆ
ˆ
( 1
2)
( 2
3)
( 4
0)
i
j
k
− −
+ − −
+ − −
i e PQ
uuur  =
ˆ
ˆ
ˆ
3
5
4