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Statements: Some books are pens. No pen is pencil. Conclusions: Some pens are books. Some pencils are books. Some books are not pencils. All pencils are books.

Only I follows
Only II and III follow
Only I and III follow
Only I and II follow

Correct Answer: Only I and III follow

Explanation:

Since one premise is particular and the other negative, the conclusion must be particular negative and should not contain the middle term. Thus, III follows. I is the converse of the first premise and so it also holds.

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