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Need of Concept Clarity

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I want to understand Validity Check in First order logic. Also I want to have technique or specific way of how to approach or answer GATE question on this topic?

Please give Pure explanation. Detailed Answer. It would be great help for GATE aspirants like me.

Thanks in Advance.
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Prove or disprove (a) ∃x(P(x) ↔ Q(x)) → ¬∀xQ(x) ∨ ∃xP(x).
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