Question
 In a group of 100 people, 70 like coffee, 50 like tea,
and 30 like both coffee and tea. How many people in the group do not like either coffee or tea?Solution
Explanation:Â Using the principle of inclusion-exclusion, the number of people who like either coffee or tea is 70 + 50 - 30 = 90. Therefore, 10 people do not like either.
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