Statements: Some keys are staplers. Some staplers are stickers. All the stickers are pens.
Conclusions:
1. Some pens are staplers.
2. Some stickers are keys.
3. No sticker is key.
4. Some staplers are keys.
Answer: D
Correct answer: Only (1) and (4) and either (2) or (3)
Some staplers are stickers and all stickers are pens, so some pens are staplers - conclusion 1; and some keys being staplers gives some staplers are keys, conclusion 4. Conclusions 2 and 3 concern stickers and keys, which the statements leave open - but between them they cover both possibilities, so either holds.
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