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Correct gas equation is:

1. V₁T₂ / R₁ = V₂T₁ / R₂
2. PV₁ / T₁ = P₂V₂ / T₂
3. RT₂ / V₁ = P₂V₂ / T₂
4. V₁ / T₁ = V₂ / T₂ = P₁P₂

Correct answer: PV₁ / T₁ = P₂V₂ / T₂

Solution

The correct gas equation is derived from the combined gas law, which relates pressure, volume, and temperature: PV/T = constant. Option B correctly represents this relationship.

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