60 students of a class were asked which TV programmes among A, B and C they had watched on a particular Sunday. 30 had watched programme A, 38 programme B, 25 programme C, 18 watched both A and B, 12 both B and C, 10 both A and C while 4 watchedall the three. Based on this information answer the following questions.

Question 54

How many watched only one programme?

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