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Establish the equivalence of the following formulas: a) ┐(p v q), ┐p ^ ┐q b) p...

Establish the equivalence of the following formulas:

a) ┐(p v q), ┐p ^ ┐q

b) p v (q ^ r), (p v q) ^ (p v r)

c) p -> (q -> r), (p ^ q) -> r

d) p <-> q, (p -> q) ^ (q -> p)

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