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Let Δ, ∇ ∈{∧, ∨} be such that p ∇ q ⇒ (( p Δ q )∇ r) is a tautology. Then (p ∇ q) Δ r is logically equivalent to :

1. (p Δ r) ∨ q
2. (p Δ r) ∧ q
3. (p ∧ r) Δ q
4. (p ∇ r) ∧ q

Correct answer: (p Δ r) ∨ q

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