If P, Q and R are three collinear points such that 
and 
Find the vector 
.
As P, Q and R are three collinear points.
Hence, 
as shown in above fig
And given 
and 
.
Therefore 
1
If P, Q and R are three collinear points such that and Find the vector .
As P, Q and R are three collinear points.
Hence, as shown in above fig
And given and .
Therefore