Some pens are red. All red things are visible. Which conclusion follows?
- A. Some pens are visible
- B. All pens are visible
- C. No pen is visible
- D. All visible things are pens
Explanation
The red pens must be visible, which establishes that some pens are visible, but the pens that are not red remain unaccounted for. A some premise can only support a some conclusion. Reversing the second premise is invalid, as always.
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