Cathy owes the local video store six overdue movies.Each of Cathy's overdue movie is a comedy, only comdies are overdue at the local video store. What premise added to this statement would make this conclusion valid?
Answer:
Cathy is the only person that owes overdue movies to the local video store.
To make the conclusion valid, we need to add a premise that establishes the exclusivity of Cathy being the only person who owes overdue movies to the local video store. Here's an example of a premise that would support the conclusion:
Premise: The local video store has a policy that only Cathy can borrow comedies, and she is the only one with overdue movies.
By adding this premise, we have clarified that Cathy is the only person who borrows and is responsible for returning comedies at the local video store. Therefore, the conclusion that only comedies are overdue at the video store and that Cathy owes them becomes valid.