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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)

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