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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

הֶסבֵּר

Use the inclusion-exclusion principle: 60 + 50 - 30 = 80.

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