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    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?
    B 10 Correct Answer Incorrect Answer
    C 20 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer

    Solution

    Explanation: 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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