If ABC three points are collinear, what is the relationship between vector OA, vector OB and vector OC

If ABC three points are collinear, what is the relationship between vector OA, vector OB and vector OC

I've omitted the word vector here
OB=λOA+μOC=(1-μ)OA+μOC=OA+μ(OC-OB)=OA+μBC
So ob-oa = μ BC
That is ab = μ BC
And AB and BC have a common point B
So ABC three points are collinear