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Moreover, groups of two performed at the same level as the best of two individuals, suggesting that this group size was too small to introduce the necessary dynamics for optimal problem-solving. However, since groups of three, four, and five were able to achieve the same results, the authors submit that groups of at least three are necessary and sufficient to perform better than the best of an equivalent number of individuals on complex problems that require understanding of verbal, quantitative, or logical conceptual systems.
Which kinda make sense since you have an extra opinion and not just two people arguing. Of course there’s already a Chinese proverb for this.
“Three smelly leather shoemakers put together can be counted as a Zhuge Liang”, who was one of the greatest statesman as well as a military strategist in ancient Chinese history.