Statements: Some boys are students. All students are teachers. Conclusions: I. Some teachers are students. II. Some boys are teachers. Which conclusion(s) follow(s)?
Explanation:
All students are teachers implies 'Some teachers are students'. Some boys are students + All students are teachers gives 'Some boys are teachers'. Both follow.
Statements: All pens are pencils. Some pencils are erasers. Conclusions: I. Some pens are erasers. II. All pencils are pens. III. Some erasers are pencils. Which conclusion follows?
Explanation:
From 'Some pencils are erasers' we can convert it to 'Some erasers are pencils'. Conclusion I does not follow because pens may be among pencils that are not erasers.
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