In a survey of 100 people, 54 use service A, 48 use service B and 37 use service C. Twenty use both A and B, 18 use both A and C, 15 use both B and C, and 8 use all three.
Find the number who use at least one service.
Find the number who use exactly one service.
36 exam-style questions on CCEA A Level Maths 2.6 Probability, covering 2.6.1 Probability, 2.6.2 Probability, 2.6.3 Probability, and 2.6 Probability. Each one has a worked solution and a mark scheme showing where the marks go.