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Option 2 : 75

The number of students who obtained 150 to 250 marks is 30

The number of students who obtained 200 to 250 marks is 45

The number of students who obtained 250 to 300 marks is 60

The number of students who obtained 300 to 350 marks is 35

The number of students who obtained 350 to 400 marks is 40

The number of students who obtained 400 to 450 marks is 35.

∴ Number of students who obtained less than 250 marks is 30 + 45 = 75 students.

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