United's Lowering Fares Is a Sufficient and Necessary Condition for American's

question 258

Multiple Choice

United's lowering fares is a sufficient and necessary condition for American's hiring pilots, given that Frontier does not improve service.

• A) (U ≡ A) ⊃ ∼F
• B) ∼F ⊃ (U ≡ A)
• C) (∼F ⊃ U) • (∼F ⊃ A)
• D) (∼F ≡ U) • (∼F ≡ A)
• E) ∼F ≡ (U ⊃ A)