Logg på
Mathematics for IGCSE & O level - Sets (Section 3 - No. 24)
In a survey, 60 people like coffee, 50 like tea, and 30 like both. How many people like coffee or tea?
80
110
140
70
Forklaring
Use the inclusion-exclusion principle: 60 + 50 - 30 = 80.
Kommentarer (0)
Logg inn for å kommentere
Annonse
Tillat at javascript laster denne siden ordentlig
