Explain Q2's 1and2

Dear Student,
Q2, a).  
Three or more points that lie on the same line are collinear points.

Pair of collinear points are: (A,B,C), ( D,O,E).

b). Three non-collinear points:
Pair of non-collinear points are:  (A,B,E), (D,O,A)

Regards