Why did the third estate believe voting in the estates- general was unfair?

The Third Estate believed voting in the Estates-General was unfair because each estate had only one vote, regardless of its size or population. This meant that the First and Second Estates, which comprised the clergy and nobility, could easily outvote the Third Estate, representing the common people, despite them being the vast majority of the population. The Third Estate felt this system marginalized their voices and interests, leading to widespread frustration and demands for reform. Their discontent ultimately contributed to the outbreak of the French Revolution.