Statement –A: The point P, Q, R respectively are collinear, if and only if  $PQ+QR=PR$

Statement –B: If there are three points in a plane, we may or may not be able to draw a line passing through them

Statement-I:                        

From the above P, Q, R are  lies on ‘m’

The points P, Q, R respectively are collinear, then  $PR=PQ+QR$

Statement –II: If 3 points are lies in a plane as

We are able to draw a line                 and these points are collinear

Now 3 points are lies in a plane as

In this case we are not able to draw a line passing through these points are non collinear.