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Option 2 : 150
Calculation:
The total number of students in school = 1000
Students who play chess = 300
Students who play football = 600
Students who play both chess and football = 50
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Hence the total number of students playing sports = 250 + 50 + 550 = 850
∴ The total number of students not playing any of the sports = 1000 – 850 = 150
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