Question: A) Prove or disprove (without using a truth table): (p q) (q p) is a tautology. B) Prove that the contrapositive holds (without using a

A)

Prove or disprove (without using a truth table): (p q) (q p) is a tautology.

B)

Prove that the contrapositive holds (without using a truth table), that is that the followingholds: p q q p

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