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MCQ
Statements: Some books are pens. All pens are erasers. No eraser is a sharpener. Conclusion: Some books are not sharpeners. Is this valid?
Biology
A Definitely true
B Definitely false
C Possibly true
D Cannot be determined
Explanation

Some books are pens, all pens are erasers, and no eraser is a sharpener. Therefore, those books that are pens cannot be sharpeners. So some books are definitely not sharpeners.

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