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If no pencil is a pen and all pens are markers, which conclusion(s) must be true? I. Some markers are not pencils.
II. No marker is a pencil.

Competition practiceSyllogism
  • AOnly II follows
  • BOnly I follows
  • CBoth I and II follow
  • DNeither I nor II follows

Step-by-Step Solution

The markers that are pens cannot be pencils, so some markers are not pencils (I). Other markers may or may not be pencils, so II is not certain.
Answer: B) Only I follows

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