GATE Computer Science (CS) 2014 Shift 1 Solved Paper

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Question : 63 of 65

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Which one of the following propositional logic formulas is TRUE when exactly two of p, q, and r are TRUE?

$( (p↔ q) ∧ r) ∨ (p ∧ q ∧ ∼ r)$
$( ∼ (p↔ q) ∧ r) ∨ (p ∧ q ∧ ∼ r)$
$( (p→ q) ∧ r) ∨ (p ∧ q ∧ ∼ r)$
$( ∼ (p↔ q) ∧ r) ∧ (p ∧ q ∧ ∼ r)$

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