Which mathematical algorithm fundamentally transformed Amazon's recommendation system in the early 2000s, increasing their sales by an estimated 35% and later becoming an industry standard?

In the competitive world of e-commerce, mathematical algorithms drive product recommendations, pricing strategies, and customer experience. One particular mathematical innovation revolutionized how online retailers operate, setting a new standard for the industry. Test your knowledge about this significant intersection of mathematics and retail that powers billions of dollars in sales annually.

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Item-to-Item Collaborative Filtering
K-Means Clustering
Naive Bayes Classification
Random Forest Optimization