LG-014

Logic check: All pilots are night owls. Some night owls are introverts. Which statement must be true?

Given: All pilots are night owls. Some night owls are introverts.

Key idea: “Some night owls are introverts” means there exists at least one person who is both night owls and introverts — so it is automatically true that some introverts are night owls.

Nothing guarantees that any pilots are introverts, so option 1 is not required.

• Picking the first pattern you see without checking it against all rows/columns.
• Ignoring the simplest rule (counts, rotations, alternations) and jumping to a complex story.
• Not testing your rule on the middle row/column (where many puzzles “break” bad rules).