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

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Definitions:

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