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1. (∃X)Qx ⊃ (∀X)(Rx ⊃ Sx)

Question 136

Multiple Choice

1. (∃x) Qx ⊃ (∀x) (Rx ⊃ Sx)
2. (∀x) ∼Qx ⊃ (∃x) Sx
3. (∀x) Rx / (∃x) Sx
-Which of the following propositions is an appropriate assumption for an indirect proof of the conclusion of the given argument?


A) ∼Sx
B) (∃x) Sx
C) ∼(∃x) Sx
D) ∼(∃x) ∼Sx
E) (∃x) ∼Sx

Correct Answer:

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