Multiple choice general knowledge

All informative things are useful. Some websites are not useful.

  1. Some websites are not informative.

  2. All websites are useful.

  3. None

  4. Both

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Valid syllogism: All informative things are useful (informative ⊆ useful). Some websites are not useful (websites ∩ useful ≠ websites). Since some websites fall outside the useful set and all informative things are inside it, those websites cannot be informative, meaning some websites are not informative.