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Write a non trivial denial of the following propositions: 1.a) ∀ x in R, x >...

Write a non trivial denial of the following propositions:

1.a) ∀ x in R, x > 0;

1.b) ∃ n in N such that n is prime and n is divisible by 6;

1.c) ∀ x in R, ∃ a, b ∈ Z such that x = a b .

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