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Consider the following argument:
p ∧ q
p
∴p ∨ r
Which two rules of inference were used to derive the conclusion in this argument?
a. Conjunction Introduction; DeMorgan's Laws
b. Conjunction Elimination; Disjunction Introduction
c. Disjunction Introduction; Disjunctive Syllogism
d. DeMorgan's Laws; Disjunctive Syllogism



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