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Please explained using formal proofs in predicate logic In each part below, give a formal proof...

Please explained using formal proofs in predicate logic

In each part below, give a formal proof that the sentence given is valid or else provided an interpretation in which the sentence is false.

(a) ∀xP' (x) → ∃x[P(x) → Q' (x)].

(b) ∃x[P(x) → Q' (x)] → QxP' (x).

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