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Question

Which of the following is a sound rule of inference?

a.

q ∧ (p → q) → p

b.

p → (p ∨ q)

c.

q ∨ (p → q) → p

d.

All of the above

Answer: (b).p → (p ∨ q)

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Q. Which of the following is a sound rule of inference?

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