Practice question
Question
25 persons are in a room. 15 of them play hockey, 17 of them play football and 10 of them play both hockey and football. Then the number of persons playing neither hockey nor football is:
Explanation
2 is correct because it matches established general principles where 2 represents the functional mechanism. Alternatives such as 17, 13 contradict experimental evidence and standard textbook descriptions, making them inappropriate for this specific context.
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