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When Using Reductio Ad Absurdum to Prove (X)Fx ⋁ ($X)Gx

Question 45

Multiple Choice

When using reductio ad absurdum to prove (x) Fx ⋁ ($x) Gx, we begin by assuming

A) ~(x) Fx ⋁ ($x) Gx.
B) (x) Fx.
C) ~((x) Fx ⋁ ($x) Gx) .
D) (x) Fx • ~($x) Gx.

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