The Chief Examiner reported that majority of the candidates attempted this question and their performance was described as fair. Majority of them were reported not to have applied the dot product correctly.  Candidates were expected to show that if  =  and  = , then êê =  =  5 and êê =  =  . Furthermore, ٠ = ٠ =  20 -  6 = 14. If θ was the angle between  and , then cos θ =  = . Therefore, θ = cos-1() = 58.67o.