In the condition(a,b) belongs to R and ( b,c)belongs to R that implies

This question was asked in Ex 1.1, 1

In the condition
(a,b) belongs to R and ( b,c)belongs to R that implies (a,c)belongs to R,it means transitive

In the transitive condition itself.
If (a,b) belongs to R but (b,c) not belongs to R,then it is transitive or not?