Chapter 9, Level 1 Self Quiz: DII

. Choose the correct translation of the following argument.

All UFOs are spaceships. There is a spaceship only if there is an alien. We can conclude that there is a UFO only if there is an alien. (U, S, A)

1. ( x ) ( Ux ⊃ Sx )
2. ( ∃x ) Ax ⊃ ( ∃x ) Sx / ~ ( ∃x ) Ax ⊃ ~ ( ∃x ) Ux

1. ( x ) ( Ux ⊃ Sx )
2. ( ∃x ) Sx ≡ ( ∃x ) Ax / ~ ( ∃x ) Ax ⊃ ~ ( ∃x ) Ux

1. ( x ) ( Ux ≡ Sx )
2. ( ∃x ) Sx ≡ ( ∃x ) Ax / ~ ( ∃x ) Ax ≡ ~ ( ∃x ) Ux

1. ( x ) ( Ux ≡ Sx )
2. ( ∃x ) Sx ≡ ( ∃x ) Ax / ( ∃x ) ~ Ax ≡ ~ ( ∃x ) Ux

Choose the correct translation of the following argument.

All UFOs are spaceships. There is a spaceship only if there is an alien. We can conclude that there is a UFO only if there is an alien. (U, S, A )

Chapter 9, Level 1 Self Quiz: DII

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