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:
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17 of them doesn't play anything
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Answer:
3
Explanation:
only play hockey = 15-10=5
only play football=17-10=7
5+7+10=22
25-22=3
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